bit-by-bit

形容词 bit-by-bit:

1. one thing at a time
   同义词：in small stages, piecemeal, step-by-step, stepwise

副词 bit-by-bit:

1. a little bit at a time
   同义词：piecemeal, little by little, bit by bit, in stages
2. in a gradual manner
   同义词：gradually, bit by bit, step by step