flex(n = noun.act) - the act of flexing; "he gave his biceps a flex to impress the ladies"
is a kind of flexion, flexure
Derived form verb flex₁

1.  flex(v = verb.motion) - contract; "flex a muscle"
is one way to contract, shrink
Derived form noun flex₁
Sample sentences: Something ----s; Somebody ----s something

2.  flex(v = verb.perception) - exhibit the strength of; "The victorious army flexes its invincibility"
is one way to flash, flaunt, ostentate, show off, swank
Sample sentences: Somebody ----s something

3.  flex(v = verb.motion) bend - form a curve; "The stick does not bend"
is one way to change form, change shape, deform
Derived forms noun flexure₃, noun flexure₂
Sample sentences: The glass tubes flex

4.  flex(v = verb.contact) bend - bend a joint; "flex your wrists"; "bend your knees"
is one way to move
Derived forms noun flexure₃, noun flexure₁
Sample sentences: Somebody ----s something

5.  flex(v = verb.contact) bend, deform, turn, twist - 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"
is one way to change form, change shape, deform
Derived form adjective flexible₂
Sample sentences: Something ----s; Somebody ----s something; Something ----s something

   To bend; as, to flex the arm. [1913 Webster]

   Flax. Chaucer. [1913 Webster]

flex, v.
1 tr. & intr. bend (a joint, limb, etc.) or be bent.
2 tr. & intr. move (a muscle) or (of a muscle) be moved to bend a joint.
3 tr. Geol. bend (strata).
4 tr. Archaeol. place (a corpse) with the legs drawn up under the chin.

flex, n. Brit. a flexible insulated cable used for carrying electric current to an appliance.

Etymology:
abbr. of FLEXIBLE

VB  be curved curve, sweep, sway, swag, sag, deviate, curl, turn, reenter, render curved, flex, bend, curve, incurvate, inflect, deflect, scatter, refract (light), crook, turn, round, arch, arcuate, arch over, concamerate, bow, curl, recurve, frizzle, rotundity, convexity.

VB  stretch, flex, extend, distend, be elastic, bounce, spring back.

flex time