1(with reference to a limb or joint) bend or become bent: [with object]:she saw him flex his ankle and wince [no object]:it’s important to prevent the damaged wrist from flexing
[with object] cause (a muscle) to stand out by contracting or tensing it:a group of bodybuilders flexed their muscles
[no object] (of a muscle) contract or be tensed:a muscle flexed in his jaw
[no object] (of a material) be capable of warping or bending and then reverting to shape:set windows in rubber so they flex during an earthquake
2 (as adjective flexed) Archaeology relating to or denoting a practice of burying a corpse with the legs drawn up under the chin.
