flex

the act of flexing; "he gave his biceps a flex to impress the ladies"

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"; "bend your knees"

cause (a plastic object) to assume a crooked or angular form; "bend the rod"; "twist the dough into a braid"; "the strong man could turn an iron bar"