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Jyutping oi1 si1
Pinyin āi sī

Definitions (CC-CEDICT)
  1. grief-stricken thoughts
  2. mourning
Definitions (Wiktionary)
  1. noun
    sad memories (of the deceased); grief
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)