Definition of “a head of steam” - English Dictionary

british dictionary

“a head of steam” in British English

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a head of steam

the force produced by a large amount of steam in a closed space

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.

(Definition of “a head of steam” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)