bit by bit

/bɪt baɪ bɪt/
adverb
  1. Slowly and gradually, one small step at a time.
    • The team rebuilt the engine bit-by-bit over several weeks.
    • Bit-by-bit, the garden began to bloom in the spring.
    • She learned the piano bit-by-bit, practicing every day.
Antonyms
What does "bit by bit" mean? | whatsthatwordmean | whatsthatwordmean