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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
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[with object] cause (a muscle) to stand out by contracting or tensing it: a group of bodybuilders flexed their muscles
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[no object] (of a muscle) contract or be tensed: a muscle flexed in his jaw
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[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
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2 (as adjective flexed) Archaeology relating to or denoting a practice of burying a corpse with the legs drawn up under the chin.
