head of steam

名词 n.

英文释义

名词 n.
  1. A significant amount of energy, vigour or momentum, sufficient to make progress or succeed in a task. idiomatic
    — "They were keeping a full head of steam, and a profound rumbling, as of an empty furniture van trotting over a bridge, made a sustained bass to all the other noises of the place."
  2. Used other than figuratively or idiomatically: see head, steam.

词形变化

heads of steam plural

词源

The figurative sense is by metaphor from the literal one: the need of the boiler of a steam locomotive to exceed a minimum amount of pressure before the locomotive could start moving.
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