on the fiddle
在行为或活动中耍小聪明，以欺骗或获得不正当利益。
口语·描述欺诈或不正当行为
英文释义
engaging in dishonest or fraudulent activities, especially for personal gain
例句
The accountant was caught on the fiddle, embezzling company funds for years.
典故来源
源自英国俚语，fiddle指小提琴，引申为耍花招或欺诈，19世纪用于描述不诚实行为。