TIP-OFF Meaning of TIP-OFF in English /tip"awf', -of'/ , n. Informal.1. the act of tipping off. 2. a hint or warning: They got a tip-off on the raid.[ 1910-15; n. use of v. phrase tip off ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012