Step by step; gradually and steadily progressing.
問題は一歩一歩解決していけばいい。
You can solve the problem step by step.
病気からの回復は一歩一歩の積み重ねだ。
Recovery from illness is a process of steady, step-by-step progress.
大きな目標も一歩一歩近づけば達成できる。
Even big goals can be achieved if you approach them step by step.