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• by-and-by
  by-and-by

  noun

  the future.
• by and by
  by and by

  adverb

  presently or eventually

by-and-by

American  

[bahy-uhn-bahy] / ˌbaɪ ənˈbaɪ /

noun

1. the future.

   to meet in the sweet by-and-by.

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by and by British  

adverb

1. presently or eventually

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noun

1. a future time or occasion

by and by Idioms  

1. After a while, soon, as in She'll be along by and by. The expression probably relies on the meaning of by as a succession of quantities (as in “two by two”). This adverbial phrase came to be used as a noun, denoting either procrastination or the future. William Camden so used it for the former (Remains, 1605): “Two anons and a by and by is an hour and a half.” And W.S. Gilbert used it in the latter sense when Lady Jane sings plaintively that little will be left of her “in the coming by and by,” that is, as she grows old (Patience, 1881). [Early 1500s]

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Etymology

Origin of by-and-by

1300–50; Middle English bi and bi one by one, at once. See by