Learn how to say Flex correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word flex:
1(with reference to a limb or joint) bend or become bent:
she saw him flex his ankle and wince
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.
flex one’s muscles
early 16th century: from Latin flex- ‘bent’, from the verb flectere