the.com/turncoat

Loyalty with a return policy, exercised at the worst possible moment.

means A person who abandons their group, cause, or side for the opposing one, especially when it's convenient or self-serving.

from From the literal idea of a soldier turning his coat inside out to hide the colors or insignia of his side — the popular legend even tells of coats made reversible, one color on each side, so a wearer could switch allegiance in a heartbeat depending on who showed up. Whether or not anyone actually sewed such a coat, the image stuck: flip the fabric, flip the loyalty. The word surfaces in English by the 1500s-1600s, already carrying its sting of betrayal.

origin theory
coat reversible to show other side's colors
synonym drift
once meant defector, now means any betrayer
politics favorite
used constantly, never self-applied
timing
always switches right before you needed them
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