underspeed

English

Etymology

From under- +‎ speed

Noun

underspeed (uncountable)

  1. A speed lower than the minimum operating speed.
    • 1961 August, “The English Electric Type 5 3,300 h.p. "Deltic" diesels for British Railways”, in Trains Illustrated, page 469:
      An underspeed switch drops the load off if engine speed falls to 380 r.p.m. and an overspeed governor shuts the engine off if its speed rises above 1,700 r.p.m.

Antonyms
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