Taxonomy of meanings for 先生:  

  • YOU
    • NP[post-npro_1.][post=npro_2]you, master
  • OLD
    • NPpluralelders
  • ANCESTOR
    • NP[post-N][my] ancestor
  • TEACHER
    • NP(post-N)my elder master, our master, the master, our elder masters etc.
    • NPnonreferentialthe teacher; some teacher
    • NP(post-N) one's teacherCH
    • NPpostthe teacher who is an NCH
  • HUMAN
    • NPpost=NprMr 差不多先生