flex1
¦ verb
1. bend (a limb or joint).
2. contract or tense (a muscle).
3. warp or bend and then revert to shape.
4. [as adjective flexed] Archaeology relating to or denoting the practice of burying a corpse with the legs drawn up under the chin.
Origin
C16: from L. flex-, flectere 'bend'.
--------
flex2
¦ noun Brit. a flexible insulated cable used for carrying electric current to an appliance.
Origin