The term "tipping off" refers to the act of providing someone with inside information or giving hints or clues about something important. Its antonyms are straightforward and clear-cut; those being "keeping quiet", "withholding information", and "keeping mum". These terms imply keeping something to oneself without revealing it to others, keeping a secret, remaining silent, or simply not disclosing any information. They are entirely opposite to "tipping off", which involves divulging information. In certain situations, such as in a confidential agreement, "keeping quiet" or "withholding information" may be necessary and required for ethical reasons. It is essential to know and understand the antonyms of "tipping off" to communicate more effectively and avoid misunderstandings.