Dictionary definition · flex
noun
- the act of flexing"he gave his biceps a flex to impress the ladies"
verb
- contract"flex a muscle"
- exhibit the strength of"The victorious army flexes its invincibility"
- form a curve"The stick does not bend"
- bend a joint"flex your wrists"
- cause (an object) to assume a crooked or angular form"bend the rod"
Source: Open English WordNet (CC BY 4.0).