1.
in small amounts, fiddly, bit by bit
Describes doing something in a small, meticulous, or tediously detailed way. Can carry a slightly negative nuance of being overly small-scale or petty.
ちまちま is an onomatopoeia that describes actions done in a small, meticulous, or petty manner.
Usage
Often carries a slightly negative or self-deprecating tone, implying that the effort is small-scale or tedious. However, it can also be used neutrally for careful, detail-oriented work.