The meaning of FLEX is to bend especially repeatedly. How to use flex in a sentence.

FLEX definition: 1. to bend an arm, leg, etc. or tighten a muscle: 2. (of a material) to bend without breaking, or…. Learn more.

1. to bend, as a part of the body. 2. to tighten (a muscle) by contraction.

If you flex your muscles or parts of your body, you bend, move, or stretch them for a short time in order to exercise them. He slowly flexed his muscles and tried to stand. [VERB noun]

He flexed the muscles of his right arm. The election will give us a chance to flex our political muscles.

In modern slang, particularly popular in digital spaces and among youth culture, 'flex' signifies the act of showing off. The journey from its Roman origins highlights both physical adjustment and the social …

Jan 18, 2026 · Verb flex (third-person singular simple present flexes, present participle flexing, simple past and past participle flexed) (transitive, chiefly physics or biomechanics) To bend something.

flex2 (fleks), adj. Informal Terms flexible: a flex program of workers' benefits.

Definition of flex verb in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Flex definition: To bend (something pliant or elastic).