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

1.
gian lận, làm ăn phi pháp
involved in dishonest or illegal activities, especially involving money
:
•
He was caught on the fiddle, taking money from the company.
Anh ta bị bắt quả tang gian lận, lấy tiền của công ty.
•
Many politicians are suspected of being on the fiddle.
Nhiều chính trị gia bị nghi ngờ gian lận.