Someone who pretends to be friendly but secretly betrays or deceives you.
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A person who appears friendly but is secretly dishonest and works against you.
When you call someone a snake in the grass, you mean they hide their true motives and can't be trusted.
It's used when someone turns out to be two-faced or harmful despite appearing harmless.
"Wolf in Sheep's Clothing"
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Someone dangerous who pretends to be harmless or kind
"Two-Faced"
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A person who acts friendly to your face but says negative things behind your back
"Snake in the Grass"
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A quietly disloyal person who hides their harmful intentions