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English definition of “witness to sth”

witness to sth

UK formal phrasal verb with witness     /ˈwɪt.nəs/ verb [T]
to say publicly, especially in a law court, that something is true or that it happened: A handwriting expert witnessed to the authenticity of the letter. [+ -ing verb] She witnessed to having seen the robbery take place.Court cases, orders and decisions
(Definition of witness to sth from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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