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

1.
fraudar, trapacear
involved in dishonest or illegal activities, especially involving money
:
•
He was caught on the fiddle, taking money from the company.
Ele foi pego em fraude, pegando dinheiro da empresa.
•
Many politicians are suspected of being on the fiddle.
Muitos políticos são suspeitos de estarem envolvidos em fraudes.