accumulate day by day and month by month; accumulate over a long period; by slow accumulation
❍ ～，有了一大包银子。(冯梦龙《醒世恒言》三) Bit by bit he accumulated a large parcel of silver.
日积月累
accumulate over a long period;by piecemeal accumulation
他～，有了丰富的经验。He has gradually accumulated a wealth of experience.
日积月累rì jī yuè lěi
形容一天一月地不断积累。accumulate over a long period, day by day and month by month, days and months multiplying