HSK 7-9
吹牛
chuīniú动
to talk big; to brag; to shoot off one's mouth; (dialect) to chat idly
他总爱吹牛却很少行动。
Tā zǒng ài chuī niú què hěn shǎo xíng dòng.
He always brags but rarely takes action.
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Appears across levels (7-9) in the HSK 3.0 word list.