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
嘴馋得口水快要流下来了。形容贪馋。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