After lunch slump
Hi. I bumped into this expression in a book about teaching. I guess it means the moment you feel sleepy after having lunch but I would like to have your confirmation guys.
So what's the meaning of "after lunch slump"?
Thanks!

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That's exactly right. It's an 'energy low' after eating.

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Without having the context in which you found the phrase, I would assume you are correct. :)  Sounds right to me.

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"after-lunch" should be hyphenated.