HSK 7-9
忙活
mánghuo动
to be really busy; pressing business
大家为晚上的演出忙活半天。
Dàjiā wèi wǎnshàng de yǎnchū mánghuo bàntiān.
Everyone spent half the day preparing for the evening performance.
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Appears across levels (7-9) in the HSK 3.0 word list.