noun
( informal ) secret information that sb gives, for example to the police, to warn them about an illegal activity that is going to happen :
The man was arrested after an anonymous tip-off.
noun
( informal ) secret information that sb gives, for example to the police, to warn them about an illegal activity that is going to happen :
The man was arrested after an anonymous tip-off.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005