Pack things in a bag, as in “Please bag it,” the customer said to the checkout clerk. This usage mainly describes packing groceries or other purchases into a bag. [ ; late 1500s ]
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Abandon something or someone, quit. For example, The class is not very good, so I've decided to bag it. This idiom first became widespread among students. [ ; 1960s ]
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Be quiet, stop doing something, go away. For example, I've heard enough about that, so just bag it! [ ; 1960s ]