put someone on notice

put (one) on notice

To warn or alert someone to something that may, is about to, or will likely occur. We're putting parents on notice after we received complaints about students being bullied after school. Companies are being put on notice that their interest rates are likely to rise in the new year.
See also: notice, on, put

put someone on notice (or serve notice)

warn someone of something about or likely to occur, often in a formal or threatening way.
See also: notice, on, put, someone
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