Synonyms and related words :
bit by bit, by degrees, by inches, by inchmeal, by slow degrees, by snatches, degreewise, drop by drop, foot by foot, gradatim, grade by grade, gradually, in detail, in driblets, in installments, in lots, in small doses, in snatches, inch by inch, little by little, part by part, piece by piece, piecemeal, slowly, step by step