(1):

(n.) A man who makes a practice of amusing others by low tricks, antic gestures, etc.; a droll; a mimic; a harlequin; a clown; a merry-andrew.

(2):

(v. i.) To act the part of a buffoon.

(3):

(v. t.) To treat with buffoonery.

(4):

(a.) Characteristic of, or like, a buffoon.