HSK 7-9
勾结
gōujié动
to collude with; to collaborate with; to gang up with
商人勾结官员骗取资金。
Shāng rén gōu jié guān yuán piàn qǔ zī jīn.
The merchant colluded with an official to obtain funds fraudulently.
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Appears across levels (7-9) in the HSK 3.0 word list.