head of steam

短语

发音

AU

词形变化

heads of steam 复数 heads of steam

释义与例句

n.
  1. 1.

    A significant amount of energy, vigour or momentum, sufficient to make progress or succeed in a task.

    习语
  2. 2.

    Used other than figuratively or idiomatically: see head, steam.

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.

来源：wiktionary