1265, from O.Fr.
bouton, boton "a button, bud," from
bouter, boter "to thrust" (see
butt (v.)). Thus a
button is, etymologically, something that pushes up, or thrusts out.
Button-hole (n.) is from 1561; the verb is from 1862, an alteration of
button-hold (1834) "to catch someone by the button and hold him in conversation against his will."