by and by

by and by idiom
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]

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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