入木三分 [－－－－]

Jyutping jap6 muk6 saam1 fan1
Pinyin rù mù sān fēn

Definitions (CC-CEDICT)
  1. written in a forceful hand
  2. penetrating
  3. profound
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase, idiomatic
    written in a forceful hand; penetrating; profound