xí​yǔ​xìng​chéng

habit becomes second nature

  1. habit
    (bound form) habit; custom; a long-term behavioral tendency or social fashion
  2. conjunction
    and
    and; together with; connecting identical parts of speech or phrases in a parallel or choice relationship
  3. xìng nounadjective
    nature
    nature; property; quality; the innate characteristics of a person or thing
  4. chéng verbparticle
    to become
    to become; to turn into; to change into