GNU Collaborative International Dictionary of English

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  1.       
    
    High-pressure , a.
    1. Having or involving a pressure greatly exceeding that of the atmosphere; -- said of steam, air, water, etc., and of steam, air, or hydraulic engines, water wheels, etc.
      1913 Webster
    2. Fig.: Urgent; intense; as, a high-pressure business or social life.
      1913 Webster
    3. Using intense psychological pressure or other incentives to convince others to do things; aggressively persistent; as, high-pressure salesmen; high-pressure tactics.
      PJC

      High-pressure engine, an engine in which steam at high pressure is used. It may be either a condensing or a noncondensing engine. Formerly the term was used only of the latter. See Steam engine.

      1913 Webster