HSK 7-9
狼吞虎咽
lángtūn-hǔyànto wolf down one's food (idiom); to devour ravenously; to gorge oneself
他饿得坐下便狼吞虎咽。
Tā è de zuòxià biàn lángtūn-hǔyàn.
He was so hungry that he wolfed down his food as soon as he sat.
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Appears across levels (7-9) in the HSK 3.0 word list.