閉門思過 [闭门－过]

Jyutping bai3 mun4 si1 gwo3
Pinyin bì mén sī guò

Definitions (CC-CEDICT)
  1. shut oneself up and ponder over one's mistakes
Definitions (粵典–words.hk)
  1. 語句
    閂​埋門​，​喺​屋企​反省​過錯
    to reflect on one's own mistakes behind closed doors
Definitions (Wiktionary)
  1. phrase, idiomatic
    to shut oneself away and reflect on one’s mistakes