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Casual TermPlay
Greenback is informal, suitable for casual speech rather than official documents. SlideCould you lend me a few greenbacks until next week?
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American EnglishPlay
Used primarily in American English, so it's less familiar to non-American English speakers. SlideIn America, people often call money greenbacks.
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Not Plural SpecificPlay
Can refer to any amount, not necessarily plural; 'greenback' can mean one dollar or many. SlideI only have one greenback with me.