sleep on (someone or something)

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sleep on (someone or something)

slang To fail to appreciate or ignore the significance of someone or something. Typically used as an imperative. Don't sleep on this song—it's so good! A lot of people slept on this team coming into the playoffs, but now everyone is waking up to how good they are.
See also: on, sleep
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

sleep on something

 
1. Lit. to recline on something and slumber. I like to sleep on a firm bed. Mary had to sleep on the floor because her sister was visiting.
2. Fig. to postpone a decision until one has slept through the night. (As if one were going to think through the decision while sleeping.) It sounds like a good idea, but I'd like to sleep on it before giving you my response. You go home and sleep on it and give me your answer in the morning.
See also: on, sleep
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.

sleep on

v.
To think about something overnight before deciding: If you can't make a decision right now, sleep on it, and give me your answer in the morning.
See also: on, sleep
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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