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gradually; by degrees; little by little; more and more; increasingly
steps; stairs; staircase; terrace
だんだん寒くなってきましたね。
It's been getting colder and colder.
だんだん好きになった。
I gradually grew to like it.
勉強すればだんだん分かるようになる。
If you study, you'll gradually come to understand.