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To waste time (often a specific amount of time that is stated after "away"). I had to stay up late finishing my book report because I dawdled away my whole afternoon.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
dawdle something away
to waste a particular amount of time; to let a period of time slip away, wasted. You didn't finish your work because you dawdled most of your time away. You dawdle away too much time daydreaming.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.