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To squander something, usually time. You'll have to stay up all night finishing this report because you fiddled away so much time this afternoon.
fiddle something away
to waste something. She fiddled the afternoon away. Don't fiddle away the afternoon. Get to work.
To waste or squander some period of time: I fiddled away the afternoon surfing the Internet. The lazy student fiddled the night away instead of doing homework.