(1):

(v. i.) To cast reproaches and sneering expressions; to rail; to utter taunting, sarcastic words; to flout; to fleer; to scoff.

(2):

(v. i.) To reproach with contemptuous words; to deride; to scoff at; to mock.

(3):

(n.) An expression of sarcastic scorn; a sarcastic jest; a scoff; a taunt; a sneer.