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English word flex comes from Latin flecto, Latin flectere
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flecto (Latin)
(figuratively) I persuade, prevail upon, or soften. I bend, curve or bow. I turn or curl.
flectere (Latin)
flexus (Latin)
(grammar) inflection. (of speech) modulation, inflection of the voice. A bending, turning, winding. A transition, changing.
flex (English)
To bend something.. To move part of the body using one's muscles.. To repeatedly bend one of one's joints.. To tighten the muscles for display of size or strength. (countable) The act of flexing.. (countable, geometry) A point of inflection.. (uncountable) Flexibility, pliancy.. (uncountable, chiefly, British) Any flexible insulated electrical wiring.