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A German way to say something is so close to the edge of a limit it might as well be peeing on it.
Your grades are at Oberkante Unterlippe, you're one wrong answer from getting kicked out.
The pizza was at Oberkante Unterlippe, one more slice and it would have collapsed.
He was at Oberkante Unterlippe with his temper, one more insult and he'd have thrown a chair.