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gradually; by degrees; little by little; more and more; increasingly
steps; stairs; staircase; terrace
段々と空が暗くなった。
The sky gradually got dark.
段々と日本語の会話が上手になったね。
Your Japanese conversation has gradually improved.
練習すれば段々慣れていくよ。
If you practice, you'll gradually get used to it.