藏頭露尾 [－头－－]

Jyutping cong4 tau4 lou6 mei5
Pinyin cáng tóu lù wěi

Definitions (CC-CEDICT)
  1. to hide the head and show the tail (idiom); to give a partial account
  2. half-truths
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic
    to tell part of the truth but not all of it