n. a tired and ineffectual person. : I can't afford to pay mopes around here. Get to work or get out!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
mope
1568, the sound of the word perhaps somehow suggestive of low feelings (cf. Low Ger. mopen "to sulk," Du. moppen "to grumble, to grouse," Dan. maabe "to mope").