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==English==
==English==
{{rfc}}


===Etymology===
===Etymology===
From the need of the boiler of a steam [[locomotive]] to exceed a minimum amount of pressure (See {{m|en|head||buildup of fluid pressure}}, also {{m|en||pressure head}}.) before the locomotive could start moving.
The [[Appendix:Glossary#figurative|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.

===Pronunciation===
* {{audio|en|en-au-head of steam.ogg|a=AU}}


===Noun===
===Noun===
{{en-noun|head=[[head]] [[of]] [[steam]]|heads of steam}}
{{en-noun|head=[[head#English:_pressure and energy in fluid dynamics|head]] [[of]] [[steam]]|heads of steam}}


# {{label|en|idiomatic}} Amount of [[energy]].
# {{lb|en|idiomatic}} A significant amount of [[energy]], [[vigour]] or [[momentum]], sufficient to make progress or succeed in a task.
#* {{quote-book|1=en|year=1919|author=w:Joseph Conrad|title=Typhoon|page=|passage="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."}}
#* {{quote-news
#* {{quote-journal|en|year=1945|month=September and October|author=O. S. Nock|title=Wartime Locomotive Working on the G.W.R.—2|journal=Railway Magazine|page=255|text=Soon after passing the site of Stretfordbridge Junction Edwards opened out to 25 per cent; boiler pressure was still full up, and Taylor was spreading what was left of the fire so as to arrive in Shrewsbury with only a light '''head of steam'''.}}
|year=2011
#* {{quote-journal|en|year=1961|month=March|author="Dalmore"|title=Driving and firing modern French steam steam locomotives|journal=Trains Illustrated|page=150|text=[literal sense] Caffiers and Boulogne were passed with a full boiler and a full '''head of steam''', and going up Neufchâtel I couldn't stop her blowing off.}}
|date=January 25
#* {{quote-journal|en
|date=January 25, 2011
|author=Paul Fletcher
|author=Paul Fletcher
|title=Arsenal 3 - 0 Ipswich (agg 3 - 1)
|title=Arsenal 3 - 0 Ipswich (agg 3 - 1)
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|page=
|page=
|passage=Arsenal were starting to work up a '''head of steam''' and Tractor Boys boss Paul Jewell cut an increasingly frustrated figure on the touchline.}}
|passage=Arsenal were starting to work up a '''head of steam''' and Tractor Boys boss Paul Jewell cut an increasingly frustrated figure on the touchline.}}
#* {{quote-journal|en|date=2021 March 10|author=Greg Morse|title=Telling the railway's story on film|journal=RAIL|issue=926|page=43|text=[literal sense] The film is really about the driver taking control of his charge... the fireman creating a fine '''head of steam'''... the signalman keeping the traffic moving safely... [...].}}
# {{&lit|en|head#English:_pressure and energy in fluid dynamics|steam}}

====Related terms====
{{col3|en
|{{l|en|steam up#English:_build up a head of steam, intransitively}}
}}

Latest revision as of 08:02, 2 June 2024

English

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Etymology

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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.

Pronunciation

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Noun

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head of steam (plural heads of steam)

  1. (idiomatic) A significant amount of energy, vigour or momentum, sufficient to make progress or succeed in a task.
    • 1919, Joseph Conrad, Typhoon:
      "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."
    • 1945 September and October, O. S. Nock, “Wartime Locomotive Working on the G.W.R.—2”, in Railway Magazine, page 255:
      Soon after passing the site of Stretfordbridge Junction Edwards opened out to 25 per cent; boiler pressure was still full up, and Taylor was spreading what was left of the fire so as to arrive in Shrewsbury with only a light head of steam.
    • 1961 March, "Dalmore", “Driving and firing modern French steam steam locomotives”, in Trains Illustrated, page 150:
      [literal sense] Caffiers and Boulogne were passed with a full boiler and a full head of steam, and going up Neufchâtel I couldn't stop her blowing off.
    • 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.
    • 2021 March 10, Greg Morse, “Telling the railway's story on film”, in RAIL, number 926, page 43:
      [literal sense] The film is really about the driver taking control of his charge... the fireman creating a fine head of steam... the signalman keeping the traffic moving safely... [...].
  2. Used other than figuratively or idiomatically: see head,‎ steam.
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