How do you spell Gibing

Available Definitions:
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.