HSK 7-9
插手
chāshǒu动
to get involved in; to meddle; interference
家庭内部问题外人不宜插手。
Jiā tíng nèi bù wèn tí wài ren bù yí chā shǒu.
Outsiders should not meddle in an internal family matter.
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Appears across levels (7-9) in the HSK 3.0 word list.