testify

testify — verb

1. to make a formal statement while serving as a witness at a trial, telling the co

1.verbtransitive / intransitiveB2
Definition

to make a formal statement while serving as a witness at a trial, telling the court what you know about the case after swearing to tell the truth

Example

Shirin testified that she saw the man leave the building just before midnight.

testify + that-clause for reporting what a witness saw

Rachid was afraid to testify against his former boss in court.

testify against [person]

Common collocations
  • testify in court
  • testify under oath
  • testify against someone
  • testify for the defence/prosecution
  • testify to something
Synonyms
  • bear witness

    very formal; often used in religious or solemn legal contexts

  • give evidence

    common in British legal English; interchangeable with 'testify' in court contexts

  • attest

    formal; emphasises certifying that something is genuine or true, not necessarily in court

Antonyms
  • perjure oneself

    to lie intentionally while under oath — the opposite of truthful testimony

Grammar Patterns

testify (in court)

testify + that-clause

testify against [person]

testify for [person]

testify to [fact]

Usage Note

Frequently used with a that-clause (testify that…) or with the prepositions 'against' (testify against someone) and 'for' (testify for the defence). The speaker is always a person who has sworn an oath to tell the truth.

Common Mistakes

He testimony in court yesterday.
He testified in court yesterday.
'testimony' is a noun; the verb form is 'testify'.
She testified him of the crime.
She testified that he committed the crime.' or 'She testified against him in court.
'testify' is not followed by a direct object referring to a person.

2. if a fact, event, or situation testifies to something, it provides clear evidenc

2.verbintransitiveC1
Definition

if a fact, event, or situation testifies to something, it provides clear evidence that something exists or is true — for example, messy roads testifying to the strength of a storm, or old photographs testifying to a town's history

Example

The empty streets testified to the seriousness of the storm warning.

inanimate subject + testify to + abstract noun

Mizuki's success testifies to years of hard work and determination.

Common collocations
  • testify to the fact that
  • testify to the importance/quality/strength of
  • testify to someone's character/talent/determination
Synonyms
  • attest to

    even more formal; used in academic or formal writing

  • bear witness to

    more literary or emphatic; has a solemn tone

  • demonstrate

    less formal and much more common in everyday language

  • indicate

    weaker in force; suggests evidence points towards a conclusion rather than proving it

Antonyms
  • contradict

    to be in opposition to the evidence or claim

  • belie

    to give a false impression of something; opposite of revealing the truth

Grammar Patterns

testify to [noun phrase]

Usage Note

Only used in the pattern 'testify to + noun phrase'. The subject must be a thing (fact, event, object, action) — never a person. This sense cannot be followed by a that-clause.

Common Mistakes

The facts testify that the system works.
The facts testify to the effectiveness of the system.
This sense takes 'to + noun phrase', not a that-clause.
Phrasal verbs

testify to

phrasal verb

To show or prove that something is true or exists.

The empty streets testify to the success of the lockdown.

Her smile testified to her happiness after winning the prize.

Word family

  • testimony
    nounB2
  • testimonial
    nounC1
  • testifier
    nounC2

Synonym discussion

Sense: verb/1

All four words refer to stating that something is true based on personal knowledge, but they differ in context and formality. 'Testify' is the standard legal term for speaking under oath in court, though it also appears in broader formal contexts. 'Bear witness' carries a solemn, often religious tone and is more literary — a person bears witness to an event they experienced directly. 'Attest' focuses on certifying the genuineness or accuracy of something, frequently used in official documents ('attested copy'). 'Give evidence' is the most common British English alternative to 'testify' in everyday courtroom language. In American English, 'testify' dominates. For example: a witness testifies in a criminal trial, a friend attests to your character in a letter, and a survivor bears witness to the horrors of war in a memoir.

testify ↗bear witnessattestgive evidence

Common collocations

Nouns

Adverbs

Phrases

  • under oath
  • in court

Prepositions

Etymology

LatinOld FrenchEnglish

From Latin 'testificari' (to bear witness), formed from 'testis' (witness) and 'facere' (to make or do). The word entered Middle English through Old French 'testifier' in the 1300s, originally carrying the legal meaning of declaring under oath. The figurative sense — where facts or events serve as evidence — developed later in the 1600s.