v. & n. literary
v. 1 intr. a (usu. foll. by on, upon) ponder, reflect. b (usu. foll. by on) gaze meditatively (on a scene etc.). 2 tr. say meditatively.
n. archaic a fit of abstraction.
[ ME f. OF muser to waste time f. Rmc perh. f. med.L musum muzzle ]