head of steam


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From the need of the boiler of a steam locomotive to exceed a minimum amount of pressure (See head ‎(buildup of fluid pressure), also pressure head.) before the locomotive could start moving.


head of steam ‎(plural heads of steam)

  1. (idiomatic) Amount of energy.
    • 2011 January 25, Paul Fletcher, “Arsenal 3 - 0 Ipswich (agg 3 - 1)”, in BBC[1]:
      Arsenal were starting to work up a head of steam and Tractor Boys boss Paul Jewell cut an increasingly frustrated figure on the touchline.