WordNet (r) 3.0 (2006):
ward off v 1: prevent the occurrence of; prevent from happening; "Let's avoid a confrontation"; "head off a confrontation"; "avert a strike" [syn: debar, forefend, forfend, obviate, deflect, avert, head off, stave off, fend off, avoid, ward off] 2: avert, turn away, or repel; "Ward off danger"