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English definition of “witness”

witness

verb [T]     /ˈwɪtnəs/
to see something happen, especially an accident or a crime: The police want to hear from anyone who witnessed the incident. witness an attack/crime
to sign your name on an official document to prove that an event has happened or that someone is who they say they are: witness an agreement/contract/signature She asked a colleague to witness the contract.
(Definition of witness verb from the Cambridge Business English Dictionary © Cambridge University Press)
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