ward off(v.+adv.)
防止;避免protect or defend yourself against danger, illness, attack, etc.
▲ward sb/sth⇔off
She put up her hands to ward him off.她举起双手把他挡开。
He always carries a stick to ward off wild dogs.他常常拿着一根棍子防野狗。
She raised her hand to ward off a blow.她抬起手来,以挡开揍来的拳头。