speed trap

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Also see: trap

Concise Oxford English Dictionary © 2008 Oxford University Press:
speed/spiːd/

▶noun

• 1 the rate at which someone or something moves or operates or is able to move or operate.

  ■ rapidity of movement or action.

• 2 each of the possible gear ratios of a bicycle or (US) of a motor vehicle.

• 3 the light-gathering power or f-number of a camera lens.

  ■ the duration of a photographic exposure.

  ■ the sensitivity of photographic film to light.

• 4 informal an amphetamine drug, especially methamphetamine.

• 5 archaic success; prosperity.

▶verb (past and past part. sped)

• 1 move quickly.

  ■ (speed up) move or work more quickly.

  ■ (also speed something up) cause to happen more quickly.

• 2 (of a motorist) travel at a speed greater than the legal limit.

• 3 informal take or be under the influence of an amphetamine drug.

• 4 archaic make prosperous or successful.

– phrases
at speed quickly.
up to speed

• 1 operating at full speed or capacity.

• 2 informal fully informed or up to date.

– derivatives
speeder noun.

– origin OE spēd (n.), spēdan (v.), from the Gmc base of OE spōwan ‘prosper, succeed’.