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English definition of “a head of steam”

a head of steam

the force produced by a large amount of steam in a closed space Energy, force and powerPower and intensity a situation in which a person or an activity starts to become very active or successful : They're really beginning to build up a head of steam for their campaign .Busy and activeHurrying and doing things quicklySuccessful (things or people)
(Definition of a head of steam from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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