1. by and by - Noun
2. by and by - Adverb
3. by and by - Phrase
an indefinite time in the future
at some eventual time in the future
Source: WordNetby-and-by
All lovely things will have an ending, All lovely things will fade and die; And youth, that's now so bravely spending, Will beg a penny by and by. Conrad Aiken
He is winding the watch of his wit; by and by it will strike. William Shakespeare
Let the music keep our spirits high And let the buildings keep our children dry Let creation reveal its secrets by and by. Jackson Browne
Do well the little things now; so shall great things come to thee by and by asking to be done. Persian Proverb
Do not spit in the well - you may be thirsty by and by. Russian Proverb
He who has carried the calf will be able by and by to carry the ox. English Proverb