垂涎欲滴

chuíxiányùdī
  1. to drool with desire (idiom); to envy
  2. to hunger for

CEDICT

to drool over; to yearn for (certain food or item)

Wiktionary

嘴饞的口水快要流下來，形容極貪饞。如：「這孩子放學回家，一見到點心就垂涎欲滴。」也作「饞涎欲滴」、「饞涎欲垂」。

重編國語辭典

嘴饞得口水快要流下來，形容極貪婪

維基詞典

Entry Composition

1 垂涎 chuíxián
  1. to drool; to salivate
  2. (fig.) to covet; to desire greedily
2 欲滴 yùdī
  1. (suffix) replete (with moisture)
  2. glistening
  3. plump and tender
  4. lovely
  5. alluring