tip - off

please tell me which is the meaning of the word tip- off.
thank you for your explanation daniela

I someone gets a tip-off or is tipped-off about something then they get privileged knowledge about something.

He tipped-off the police about the terrorist plot.
Someone on the management team gave her a tip-off that there would be a job promotion on offer soon, so she has improved her timekeeping.

It is also the starting jump in a game (or section of a game) of basketball.