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To fall or sink heavily; collapse: She slumped, exhausted, onto the sofa.
(verb-intransitive)
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To droop, as in sitting or standing; slouch.
(verb-intransitive)
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To decline suddenly; fall off: Business slumped after the holidays.
(verb-intransitive)
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To perform poorly or inadequately: The team has been slumping for a month.
(verb-intransitive)
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To sink or settle, as into mud or slush.
(verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.