flex

(noun) the act of flexing. Example: "He gave his biceps a flex to impress the ladies."

(verb) contract. Example: "Flex a muscle."

(verb) exhibit the strength of. Example: "The victorious army flexes its invincibility."

(verb) form a curve. Synonyms: bend. Example: "The stick does not bend."

(verb) bend a joint. Synonyms: bend. Examples: "Flex your wrists." "Bend your knees."

(verb) cause (a plastic object) to assume a crooked or angular form. Synonyms: bend, deform, twist, turn. Examples: "Bend the rod." "Twist the dough into a braid." "The strong man could turn an iron bar."