(1):
(v. t.) To examine and judge as a critic; to pass literary or artistic judgment upon; as, to criticise an author; to criticise a picture.
(2):
(v. i.) To discuss the merits or demerits of a thing or person; esp., to find fault.
(3):
(v. i.) To act as a critic; to pass literary or artistic judgment; to play the critic; - formerly used with on or upon.
(4):
(v. t.) To express one's views as to the merit or demerit of; esp., to animadvert upon; to find fault with; as, to criticise conduct.