Definition of “witness to sth” - English Dictionary

british dictionary

“witness to sth” in British English

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witness to sth

UK formal
phrasal verb with witness uk /ˈwɪt.nəs/ us /ˈwɪt.nəs/ verb [ T ]

to say publicly, especially in a law court, that something is true or that it happened:

[ + -ing verb ] She witnessed to having seen the robbery take place.

(Definition of “witness to sth” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)