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down in the dumps

down in the dumps idiom

Also, down in the mouth. Discouraged, depressed, or sad, as in She's been down in the dumps ever since she lost the match, or What's wrong with him? He's so down in the mouth about everything. The noun dumps has been used for “a state of depression” since the early 1500s, and down in the mouth, alluding to the downturned corners of the mouth as a sign of misery, dates from the mid-1600s.

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.