twofold

twofold — adjective

1. Something that is twofold is double the starting size, number, or amount — for e

1.adjectiveB2
Definition

Something that is twofold is double the starting size, number, or amount — for example, a twofold rise in sales means the new figure is exactly two times the old one.

Example

The company reported a twofold increase in profits after opening new branches in Kaohsiung.

collocation: twofold increase in [something]

A twofold jump in student numbers forced the school to hire five new teachers.

Common collocations
  • twofold increase
  • twofold rise
  • twofold growth
  • twofold jump
  • twofold expansion
Synonyms
  • double

    More common in everyday speech; can be used as adjective, verb, or noun, whereas 'twofold' is adjective or adverb only

  • twice

    Adverb only, used in different syntactic patterns ('twice as much' vs 'a twofold increase')

Antonyms
  • half

    Refers to one of two equal parts, the opposite of doubling

Grammar Patterns

a twofold + noun (increase, rise, growth)

subject + be + twofold

Usage Note

This sense is most common in formal or written English with abstract nouns such as 'increase', 'rise', 'growth', 'jump'. In everyday conversation, 'double' or 'twice' are more natural.

Common Mistakes

The cost increased by twofold.
The cost increased twofold.
'twofold' already means 'by two times', so adding 'by' before it is redundant.
There was a twofolds increase.
There was a twofold increase.
'twofold' does not add -s for plural agreement.

2. Something that is twofold is made up of two distinct elements or sides that toge

2.adjectiveB2
Definition

Something that is twofold is made up of two distinct elements or sides that together form a single situation, plan, or object.

Example

The safety system had a twofold goal: warn drivers and slow traffic near schools.

pattern: purpose/reason + be + twofold + colon + list of two

The government announced a twofold strategy of building more homes and controlling rental prices.

collocation: twofold + strategy / plan / aim

Common collocations
  • twofold purpose
  • twofold aim
  • twofold strategy
  • twofold nature
  • twofold reason
  • twofold mission
Synonyms
  • dual

    Slightly more formal; often used for systems or functions ('dual role', 'dual purpose')

  • double

    Can also mean 'having two parts', but focuses more on matching or paired elements

Antonyms
  • single

    Having only one part or aspect

  • simple

    Not made up of multiple components

Grammar Patterns

subject + be + twofold

a twofold + noun (purpose, aim, nature, reason)

Usage Note

Almost always used predicatively when the two parts are listed after a colon, as in 'the reason is twofold: first… and second…'. Attributive use ('a twofold strategy') is less common but acceptable.

Common Mistakes

The reason is two folds.
The reason is twofold.
'twofold' is a single word, not two separate words.

twofold — adverb

Synonym discussion

Sense: adjective/1

'Double', 'twice', and 'twofold' all refer to multiplication by two, but they work differently in sentences. 'Double' is the most flexible — it can be an adjective ('a double portion'), a verb ('prices doubled'), a noun ('paid double'), or a determiner ('double the amount'). 'Twice' is strictly an adverb and usually appears before a noun or adjective in the pattern 'twice as [adjective/adverb] as' ('twice as expensive as') or 'twice the [noun]' ('twice the size'). 'Twofold' is the most formal and restricted of the three; it works as an adjective before nouns ('a twofold increase') or as an adverb after verbs ('increased twofold'), but it cannot be used as a verb or in the 'twice as…as' pattern. In casual speech, 'double' and 'twice' are preferred. In academic or business writing, 'twofold' appears more often with abstract nouns like 'increase', 'benefit', or 'purpose'.

double ↗twice ↗twofold ↗

Common collocations

Nouns

Phrases

  • twofold increase in
  • twofold rise in
  • twofold growth in
  • twofold purpose of

Etymology

Old EnglishEnglish

'Twofold' comes from Old English 'twifeald', a combination of 'twi-' (meaning 'two') and '-feald' (meaning 'folded' or 'multiplied by'). The '-fold' suffix was used in Old English to show how many times something is repeated, like in 'manifold' ('many times') and later 'threefold', 'fourfold', etc. The idea is that something is 'folded over itself twice' — hence doubled.