Expression of the Fortnight - 14

To be two-faced

If someone is two-faced it means that they seem pleasant and kind when they are talking to you but then behind your back they say unpleasant things about you to other people. A two-faced person is insincere.

I don't trust her. I suspect she is a bit two-faced.

Jacky is completely two-faced. She pretends to be your friend but then she bitches about you to other people!