입에 익다 = 입에 버릇이 되다. be used to it
e.g.
언니라는 말이 입에 익어서 그러는데 언니라고 부를게요
Let me call you "Sis," because I am (more) used to that[it].
입에 익어서 습관적으로 자연스럽게 나오는 감탄어들
the exclamations which are uttered habitually and naturally because people are used to them.
November 1, 2018
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