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Adjective: bit-by-bit
  1. One thing at a time
    - in small stages, piecemeal, step-by-step, stepwise
Adverb: bit by bit
  1. A little bit at a time
    "the research structure has developed bit by bit";
    - piecemeal, little by little, in stages
  2. In a gradual manner
    "the snake moved bit by bit toward its victim";
    - gradually, step by step

See also: gradual