turn coat

He would also need to persuade many of the 525 senior Democratic officers, or superdelegates, who have endorsed her to turn coat, which is currently unimaginable.

He certainly doesn’t want his Shiite ally to turn coat and befriend the West.

You see you can't never depend a grate deal on a turn coat.

When Secretary of War Weeks goes out of town over the weekend, he is not worried that the Army will turn coat or disobey during his absence.

Turn coat inside out, and smooth lining with cool iron, and with an almost dry sponge cloth.