Definition of lose steam
informal
:to lose strength, force, or energy :to slow down
- Sales have lost steam in recent weeks.
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Word by Word Definitions
lose
play
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: to bring to destruction
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: damn
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: to miss from one's possession or from a customary or supposed place
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steam
play
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: a vapor arising from a heated substance
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: the invisible vapor into which water is converted when heated to the boiling point
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: the mist formed by the condensation on cooling of water vapor
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: to give out as fumes : exhale
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: to apply steam to
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: to rise or pass off as vapor
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