To fiddle with something means to handle or manipulate it aimlessly, often in a restless or nervous manner, or to repeatedly make minor adjustments or alterations to it.
On the fiddle
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to act dishonestly in order to get something for yourself, or to change something dishonestly, especially to your advantage:
On the fiddle meaning & definition 1 of On the fiddle.
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to move things about or touch things with no particular purpose:
On the fiddle meaning & definition 2 of On the fiddle.
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