明察暗访

明察暗訪
míngchá'ànfǎng

to observe publicly and investigate privately; to conduct a thorough investigation

Wiktionary

Homographs

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

Entry Composition

1 明察 míngchá
  1. to note clearly
  2. to perceive
2 暗访 ànfǎng
  1. to make secret inquiries
  2. to investigate in secret