习以为常

習以為常
xíyǐwéicháng
  1. accustomed to
  2. used to

CEDICT

to be accustomed to

Wiktionary

养成习惯后，便成为常规。

重編國語辭典

养成习惯后，便成为常规

維基詞典

Entry Composition

1 习 xí
  1. (bound form) to practice
  2. to study
  3. habit
  4. custom
2 以为 yǐwéi to think; to believe (often with the implication that the belief is mistaken – unless referring to one's own current belief)
3 常 cháng
  1. always
  2. ever
  3. often
  4. frequently
  5. common
  6. general
  7. constant

Related entries

忕 shì
  1. accustomed to
  2. habit
惯 guàn
  1. accustomed to
  2. used to
  3. indulge
  4. to spoil (a child)
孩子不能太惯了。

You should not spoil a kid too much.

Source: Tatoeba

狃 niǔ accustomed to