To become accustomed to something and regard it as normal.
习习惯。指某种事情经常去做，或某种现象经常看到，也就觉得很平常了。
《魏书·太武五王传》将相多尚公主，王侯亦娶后族，故无妾媵，习以为常。”《逸周书·常训》民生而有习有常，以习为常。”
She was so used to the noise of the city that she slept soundly every night.
Learn the next connected idiom: 习以为常 (xí yǐ wéi cháng) → 常胜将军 (cháng shèng jiāng jūn)
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