20 to (some hour)
Twenty minutes before the next hour. Come on, kids, hurry up! It's already 20 to 8, and we have to be there by 8:10! A: "Is it 5:40? Or 20 to 6?" B: "It's both. You do know that they refer to the same time, right?" It's already 20 to 4? Oh boy, with all this traffic, there's no way we'll make it there by 4.
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