British informal Engaged in cheating or swindling.
- Now in spite of the fact Duke'd been on the fiddle, neither his wife nor his dreaded mother-in-law knew about his shenanigans.
- The cross section of hospitals that were tested was only a fraction in the country and we can safely assume that statistically most of those will be on the fiddle too.
- Our main suspicion was a sales droid on the fiddle.
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