HSK 7-9
夸夸其谈
kuākuā-qítán(idiom) to talk big; to sound off; to be full of hot air
他只会夸夸其谈却不行动。
Tā zhǐ huì kuākuā-qítán què bù xíngdòng.
He only talks big and never takes action.
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Appears across levels (7-9) in the HSK 3.0 word list.