The Austronesian Comparative Dictionary

*libák attack from concealment, criticize from a distance

PPh libák attack from concealment, criticize from a distance

WMP
Casiguran Dumagat libák for a shaman to be killed or made sick by a spirit which he has previously exorcised from some sick person (said to be the spirit’s revenge on what the shaman did)
Ilokano i-libák to hide; conceal; suppress
Ayta Abellan libak to ambush, catch by surprise
Tagalog libák mockery; derision; ridicule; insult
Aklanon libák malicious gossip; slander; backbiting
Agutaynen mag-libak to backbite, talk badly of others behind their back; to slander someone
Hiligaynon maŋ-libák to backbite; to deride
Cebuano libák to backbite, say bad things about a person when his back is turned or when he cannot understand them
Bikol mag-libák to talk about people in their absence, usually in a derogatory manner; to backbite, to criticize