poison pen

But between that one devastating tweet and this poison pen, perhaps the bodyguard was on to something.

The reader encounters "little poison-pen Gobby," a naughty boy who keeps on writing bare-faced lies.

The poison-pen puzzle, as it came to be known in the department, first bobbed up some six months before Allison tackled it.

These letters were certainly of the variety she had heard classed as poison pen.

Did you know anything about the poison-pen letters in Madison?