Mate check is a friendly but pointed reality test delivered between close friends — a check-in that's really a challenge, asking whether someone is truly being their best self or sliding into L behavior. Playing on both the British slang 'mate' (close friend) and the chess term for a game-ending king threat, a mate check is when your friend holds up a mirror and essentially says 'are you sure about this?' It's delivered with care but with receipts. The chess resonance implies a certain precision — it's not idle gossip, it's a targeted observation that demands an honest answer.
Pulled him aside before he sent that message and gave him a full mate check — he needed to hear it from someone who actually cares.
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