Unintentionally hearing a conversation that wasn't meant for your ears, usually without the speakers knowing you're listening.
From 'over-' meaning 'beyond' combined with 'hearing.' The prefix suggests exceeding or going past the normal boundaries of conversation intended for you.
The whole concept of overhearing assumes you shouldn't hear something, which is why accidentally overhearing gossip about yourself feels so violating—your brain knows it crossed an invisible boundary!
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