on the fiddle
US /ɑn ðə ˈfɪdl/
UK /ɑn ðə ˈfɪdl/

1.
做手脚, 搞欺诈
involved in dishonest or illegal activities, especially involving money
:
•
He was caught on the fiddle, taking money from the company.
他因从公司拿钱而被抓到做手脚。
•
Many politicians are suspected of being on the fiddle.
许多政客被怀疑做手脚。