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When a kid gets annoyed and wants to make someone else look like a total idiot, they give them the dagger eyes, like they’re trying to stab them with their eyes. It’s basically a lazy way to say, 'I’m smarter than you, and I know it.'
My cousin gave me dagger eyes when I spilled my lunch on his shirt.
She gave him dagger eyes after he called her a ‘fatty’ in front of the whole class.
He gave me dagger eyes when I said he failed math again.