STUMBLE ACROSS / ON / UPON STH/SB
Meaning of STUMBLE ACROSS / ON / UPON STH/SB in English
to discover sth/sb unexpectedly :
Police have stumbled across a huge drugs ring.
Oxford Advanced Learner's English Dictionary.
Оксфордский английский словарь для изучающик язык на продвинутом уровне.
2005