Why do 'I'm up for it' and 'I'm down for it' mean the same thing

Meaning of I'M DOWN FOR IT and I'M UP FOR IT - A Short English Lesson with Subtitles

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On time/early rating keeps going down even though I'm always on time or early. I know my customer rating & completion rate matter more, but it's very frustrating not knowing why this

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Meaning of I'M DOWN FOR IT and I'M UP FOR IT - A Short English Lesson with Subtitles