Definitions from Wiktionary (tip off)

▸ verb:  (idiomatic, transitive) To alert or inform (someone), especially confidentially.
▸ verb:  (basketball) To put the ball in play by throwing it up between two opponents.
▸ verb:  (of a sports match) To begin.
▸ verb:  (transitive, obsolete) To pour out (liquor); to tip the vessel and drink until it is empty.
▸ verb:  (transitive and intransitive, painting) To use a particular brush technique for producing a flawless surface on a wet coat of paint.
▸ Also see tip_off

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