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1. To sleep the entire night without waking. Our first baby was nearly nine months old before she finally started sleeping through.
2. To remain asleep while something happens. I can't believe you slept through my recital, Dad! I keep sleeping through my alarm in the morning. How on earth did the baby sleep through that racket coming from next door?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
sleep through something
to remain sleeping through some event. I didn't hear the storm. I guess I slept through it. Wally slept through the entire opera—even the loud part.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
1. Sleep without waking for a period of time, usually the night, as in At three months many babies have learned to sleep through. [Mid-1900s]
2. sleep through something. Fail to pay attention, as in We all slept through the explanation and then had trouble getting the machines started.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.