flex

/flษ›ks/
noun
  1. 1

    Flexibility, pliancy.

  2. 2

    The or an act of flexing.

  3. 3

    Any flexible insulated electrical wiring.

  4. 4

    A point of inflection.

  5. 5

    The act of flaunting something; something one considers impressive.

    โ€œ2020, Daniel Varghese, "Aesop's Hand Sanitizer Is a Flex for an Anxious Time", GQ, 6 March 2020โ€

verb
  1. 1

    To bend something.

  2. 2

    To repeatedly bend one of one's joints.

  3. 3

    To move part of the body using one's muscles.

  4. 4

    To tighten the muscles for display of size or strength.

  5. 5

    (by extension) To flaunt one's superiority.

Source: https://en.wiktionary.org/wiki/flex