Definitions
1.nounFlexibility, pliancy.
2.nounThe or an act of flexing.
3.nounAny flexible insulated electrical wiring.
4.nounA point of inflection.
5.nounThe act of flaunting something; something one considers impressive."2020, Daniel Varghese, "Aesop's Hand Sanitizer Is a Flex for an Anxious Time", GQ, 6 March 2020"
6.verbTo bend something.
7.verbTo repeatedly bend one of one's joints.
8.verbTo move part of the body using one's muscles.
9.verbTo tighten the muscles for display of size or strength.
10.verb(by extension) To flaunt one's superiority.