Compound words are formed when two or more separate words are joined together. This creates a brand new word that often has a new meaning. I think I see a pattern emerging. It's a football. Some snow ...

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Let's talk about the plurals of compound nouns. I submit to you: passers-by, hangers-on, attorneys general, brothers-in-law, and culs-de-sac. What about "month end" how would that be pluralized?