The Full Form of BTB is By The By.
incidentally.
“where’s Hector, by the by?”
‘I didn’t ask you to come. Incidentally, why have you come?’
by and by. 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.
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