onto

onto — preposition

1. to a surface or position, so that movement finishes there

1.prepositionB1
Definition

to a surface or position, so that movement finishes there

Example

Leo jumped onto the stage when the singer called his name.

jump onto + surface

The cat climbed onto the warm car roof after lunch.

Common collocations
  • jump onto
  • climb onto
  • get onto
  • roll onto
Synonyms
  • on

    describes position, not the movement that ends there

  • to

    shows direction generally, without the idea of arriving on a surface

Grammar Patterns

jump/climb/get onto + surface

Usage Note

Often follows movement verbs such as jump, climb, roll, and spill. Use this sense when something ends up on a surface; use on when the thing is already there.

Common Mistakes

She logged onto check her email.
She logged on to check her email.
Write 'on to' as two words when 'to' begins an infinitive.

2. used when talk, study, or attention turns to a different subject

2.prepositionB2
Definition

used when talk, study, or attention turns to a different subject

Example

After budgets, the meeting moved onto hiring plans.

move onto + next topic

The guide moved onto safety rules after the welcome speech.

Common collocations
  • move onto the next point
  • get onto a new subject
  • go onto discuss
Synonyms
  • to

    can mark change in direction, but is less specific about switching topics

  • on to

    is often written as two words when on belongs closely to the verb phrase

Grammar Patterns

move/get onto + new topic

Usage Note

Usually follows verbs like move, get, and go. Distinguish from sense 1: no physical movement happens here; only the subject of attention changes.

3. continuing to keep something in your hands or in your possession

3.preposition
Definition

continuing to keep something in your hands or in your possession

Example

Mia held onto the rail as the bus turned sharply.

hold onto + object

Grandpa hung onto his father's watch for fifty years.

Common collocations
  • hold onto
  • hang onto
  • cling onto
Synonyms
  • keep

    is broader and does not always suggest gripping or holding

  • hold

    focuses on the act itself; onto links the verb to the thing kept

Antonyms
  • let go of

    shows releasing the object instead of keeping it

Grammar Patterns

hold/hang onto + thing

Usage Note

Usually appears after hold, hang, cling, or similar verbs. The object is something you physically grip or choose not to give up.

Common Mistakes

Hold on the rope when the boat moves.
Hold onto the rope when the boat moves.
Use 'onto' when you mean keeping your grip on something.

4. aware of a useful person, idea, or chance that may help you

4.preposition
Definition

aware of a useful person, idea, or chance that may help you

Example

Rita is onto a cheap printer that could save the shop money.

be onto + useful idea/source

The coach thinks the team is onto a better training plan.

Common collocations
  • be onto a good thing
  • be onto something
  • be onto a winner
Synonyms
  • find

    focuses on discovery, while onto suggests recognizing value in it

  • spot

    is more momentary and less about using an advantage

Grammar Patterns

be onto + useful person/idea

Usage Note

Common in informal speech, often after be. Distinguish from sense 5: here the thing you know about is helpful or promising, not secret wrongdoing.

5. aware of someone's hidden bad action and close to proving it

5.preposition
Definition

aware of someone's hidden bad action and close to proving it

Example

The police were onto the scammer after three bank customers complained.

be onto + person doing wrong

Maya knew her parents were onto her fake sick note.

Common collocations
  • be onto someone
  • police are onto
  • parents are onto
Synonyms
  • suspect

    means think something is wrong, but not necessarily be near proof

  • catch on to

    often means realize or understand; onto someone is more about discovering hidden wrongdoing

Grammar Patterns

be onto + person doing something wrong

Usage Note

Usually after be, with subjects such as police, parents, teachers, or reporters. The object is often a person trying to hide something.

6. speaking to someone, often repeatedly, to ask for action or complain

6.preposition
Definition

speaking to someone, often repeatedly, to ask for action or complain

Example

Jade has been onto the plumber about the leaking pipe all week.

be onto someone about + problem

Parents were onto the school for clearer bus times.

Common collocations
  • be onto someone about
  • get onto the bank
  • be onto the council
Synonyms
  • contact

    is neutral and does not suggest repeated pressure

  • chase

    informally suggests repeatedly asking someone to act

Grammar Patterns

be/get onto + person + about + problem

Usage Note

Common with complaints, repair requests, and repeated follow-up. Distinguish from sense 5: here you are contacting someone directly, not discovering their secret.

Common Mistakes

I was onto with the company about the refund.
I was onto the company about the refund.
Put the person or organization directly after 'onto'.

7. so that a new part or extra item becomes attached to something else

7.preposition
Definition

so that a new part or extra item becomes attached to something else

Example

The builder added a porch onto the front of the house.

add onto + larger thing

Lina tagged two extra questions onto the survey.

Common collocations
  • add onto
  • tag onto
  • bolt onto
  • tack onto
Synonyms
  • add to

    can mean increase generally, not necessarily attach as an extra part

  • attach to

    focuses on joining, not on the idea of adding something extra

Antonyms
  • remove from

    shows taking a part away instead of adding it

Grammar Patterns

add/tag/bolt onto + larger thing

Usage Note

Usually follows add, tag, bolt, tack, or similar verbs. The thing after onto is the main object that receives an extra part.

Phrasal verbs

be onto

phrasal verb

To have discovered or understood something important, or to be close to finding a solution.

The detective is onto a major clue in the case.

Are you onto any new ideas for the project?

onto — adjective

Synonym discussion

Sense: preposition/1

For preposition sense 1, onto highlights movement that ends on a surface. On usually describes position after the movement is finished: The bags are on the bed. To marks direction more generally and does not itself show that the final position is on top of something: We walked to the table. Into is different again because it shows movement from outside to inside a space: She stepped into the room. A useful check is to ask what the final place looks like. If it is a surface, onto is often right. Compare: The child climbed onto the chair, but The child climbed into the cupboard.

on ↗to ↗into ↗

Etymology

Old EnglishEnglish

Onto developed in English from the combination of on and to. Writers use the single-word form especially when the meaning is movement toward a surface or another clearly linked sense. English still keeps the two words separate in many cases, especially when to introduces an infinitive, as in log on to check your email.