on the fiddle
on
ˈɒn
on
the
ðə
dhē
fi
fi
ddle
dəl
dēl

Definition & Meaning of "on the fiddle"in English

on the fiddle
01

used to refer to a person, organization, etc. that uses dishonest or illegal methods to gain money 

Dialectbritish flagBritish
on the fiddle definition and meaning
Disapproving
Idiom
Informal

What is the origin of the idiom "on the fiddle" and when to use it?

The origin of the idiom "on the fiddle" is believed to have originated in the mid-19th century in British English. It likely draws from the association of the violin (also called a fiddle) with trickery or manipulation, as well as the notion of playing a fraudulent tune. It is commonly used to discuss individuals who exploit loopholes, engage in tax evasion, commit fraud, or manipulate systems for personal gain.

Examples
The accountant was on the fiddle for years before anyone noticed. 
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