Putting things into bags, or in slang, successfully obtaining or catching something.
From Middle English 'bagge' with roots in Old Norse, referring to a flexible container. The '-ing' suffix makes it a present participle, turning the noun into an ongoing action.
In hunting and fishing, 'bagging' an animal meant putting it in your bag to take home, so the term stuck—now we say we 'bagged' a good deal or score, treating success like a successful hunt.
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