[ fleks ]
See synonyms for: flexflexed on Thesaurus.com

verb (used with object)
  1. to bend, as a part of the body: He flexed his arms to show off his muscles.

  2. to tighten (a muscle) by contraction.

  1. to demonstrate (one’s ability, expertise, etc.): She’s flexed her marketing skills for various clients in the publishing industry.

  2. Slang. to boast or brag about; flaunt: He’s just not into flexing his success.

verb (used without object)
  1. to bend.

  2. Slang. to boast or brag; show off: In his rap lyrics he flexes about his fancy lifestyle.

  1. the act of flexing.

  2. Slang. a boast or brag: It's not a flex, but we have the best burgers here.

  1. British.

    • any flexible, insulated electric cord; an electric cord or extension cord.

    • Slang. an elastic band, as a garter.

  2. Mathematics. an inflection point.

Verb Phrases
  1. flex on, Slang. to brag or show off to; assert one’s dominance or superiority over: She’s flexing on her haters by posting new photos of her beautiful family.

Origin of flex

First recorded in 1515–25; (adjective) from Latin flexus, past participle of flectere “to bend, turn”; (noun) from Latin flexus act of bending, equivalent to flect(ere) + -tus suffix of verbal action

Other definitions for flex (2 of 3)

[ fleks ]

  1. Informal. flexible: a flex program of workers' benefits.

Origin of flex

Shortening of flexible

Other definitions for flex- (3 of 3)


  1. a combining form representing flexible in compound words: flextime.

  • Also flexi-.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use flex in a sentence

British Dictionary definitions for flex


/ (flɛks) /

  1. British a flexible insulated electric cable, used esp to connect appliances to mains: US and Canadian name: cord

  2. informal flexibility or pliability

  1. to bend or be bent: he flexed his arm; his arm flexed

  2. to contract (a muscle) or (of a muscle) to contract

  1. (intr) to work according to flexitime

  2. to test or display (one's authority or strength)

Origin of flex

C16: from Latin flexus bent, winding, from flectere to bend, bow

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012