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Consult Chambers 21st Century Dictionary, The Chambers Thesaurus (1996) or Chambers Biographical Dictionary (1997 edition with amendments). Enter your search and choose your title from the drop-down menu.

Search results for 'speed':

speed noun 1 rate of movement or action, especially distance travelled per unit of time. 2 quickness; rapidity • with speed. 3 a gear setting on a vehicle • five-speed gearbox. 4 a photographic film's sensitivity to light. 5 drug-taking slang an amphetamine. verb, intrans 1 (sped, speeding) to move quickly. 2 (speeded, speeding) to drive at a speed higher than the legal limit. speeder noun. at speed quickly.
ETYMOLOGY: Anglo-Saxon sped.

speed up or speed something up to increase in speed or make it increase in speed.