HSK 7-9
怠工
dàigōng动
to slacken off in one's work; to go slow (as a form of strike)
公司调查员工集体怠工原因。
Gōng sī diào chá yuán gōng jí tǐ dài gōng yuán yīn.
The company investigated the cause of the employees' collective slowdown.
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Appears across levels (7-9) in the HSK 3.0 word list.