flex1
  
  v.
    - bend (a limb or joint).
- contract or tense (a muscle).
- warp or bend and then revert to shape.
- 
[as adj. flexed]
 Archaeology  relating to or denoting the practice of burying a corpse with the legs drawn up under the chin.
Etymology
  C16: from L. flex-, flectere ‘bend’.
 
  
    
flex2
  
  n.
 Brit. a flexible insulated cable used for carrying electric current to an appliance.
Etymology
  early 20th cent.: abbrev. of flexible.