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gradually; by degrees; little by little; more and more; increasingly
steps; stairs; staircase; terrace
だんだん暖かくなってきたね。
It's getting warmer gradually, isn't it.
練習するうちにだんだん上手になった。
I gradually got better as I practiced.
空がだんだん暗くなってきたから早く帰ろう。
The sky is gradually getting dark so let's go home early.