明查暗訪 míng chá àn fǎng

DEFINITIONS

  1. open enquiries and secret search (idiom); to investigate openly and in secret
  2. taking information from all sides

CHARACTERS

明 míng bright, light, brilliant; clear
查 chá investigate, examine, seek into
暗 àn dark; obscure; in secret, covert
訪 fǎng visit; ask, inquire