one’s mouth waters;be greedy;one’s mouth drools with greed ～的神情a look of unrestrained greed
垂涎欲滴chuí xián yù dī
嘴饞得口水快要流下來了。形容貪饞。make one’s mouth watery, mouth drooling with greed, covet for, gape after, lick one’s lips, lick one’s chops, start drooling at the sight of