E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Fiddle About (To).
To fiddle about a thing means to play business. To fiddle with ones fingers is to move them about as a fiddler moves his fingers up and down the fiddle-strings.
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Mere trifling, or unprofitable fidding about nothing.Barrow: Sermons, vol. i. sermon 7.