bài
  1. to bow to; to pay one's respects
  2. (bound form) to extend greetings (on a specific occasion)
  3. to make a courtesy call
  4. (bound form) (of a monarch) to appoint sb to (a position) by performing a ceremony
  5. to acknowledge sb as one's (master, godfather etc)
  6. (used before some verbs to indicate politeness)

CEDICT