Definition of "flex" in English

noun

1. (uncountable) Flexibility, pliancy.

2. (countable) An act of flexing.

3. (uncountable, chiefly UK, Ireland) Any flexible insulated electrical wiring.

4. (countable) A flexible insulated electrical cord.

5. (uncountable) Flexible ductwork, typically flexible plastic over a metal wire coil to shape a tube.

6. (countable, geometry) A point of inflection.

7. (countable, slang) An act or instance of flaunting something; a boast or brag; something considered impressive.

   • Getting together with other power players at Masa is the ultimate flex of conspicuous consumption. […] A party of five or more requires a deposit of $200 per person at least one week prior to the reservation.
   • It's an achievement to stand out from other Marvel movies in terms of special effects, but this whole movie feels like a flex for those computer wizards.

verb

1. (transitive, chiefly physics or biomechanics) To bend something.

   • The board flexes as you step on it.

2. (transitive) To repeatedly bend one of one's joints.

3. (transitive) To move part of the body using one's muscles.

4. (intransitive) To tighten the muscles for display of size or strength.

5. (transitive, slang) To boast or brag about; to flaunt (something).

6. (intransitive, slang) To flaunt one's superiority; to show off.