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dirty pool 〔美俚〕不誠實的行為,不公正的競技。

dirty work

It appears that the scheme was rejected not on the grounds that it was dirty pool but on the grounds of impracticality 這一方案沒有被通過好象并不是因為它是欺詐行為,而是因為它行不通。

He plays dirty pool 他手法卑鄙。