Definition of on or at sight in English:

on (or at) sight

As soon as someone or something has been seen: in Africa, paramilitary game wardens shoot poachers on sight
More example sentences
  • Militias have been given authority to shoot bush meat poachers on sight in the Central African Republic.
  • Nothing says trust like Delta Force, ready to shoot anyone on sight.
  • Police, who claim to have deployed 17,000 officers in the city, have been given orders to shoot on sight to avoid disorder.
See parent entry: sight

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Word of the day animalcule
Pronunciation: ˌanəˈmalˌkyo͞ol
noun
a microscopic animal