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Anonymous Buckle up in a car.1. Why is "up" used above the sentence?2. What is the role of "up" above the sentence?3. What is the meaning of "up?4. Does "up" mean the direction......(move the buckle from down to up)"up" is frequently the second component of a phrasal verb. It plays the role of "completer". It signals the completion of an action, as if to sa