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Jyutping sai3 si1 gik6 hung2
Pinyin xì sī jí kǒng

Definitions (粵典–words.hk)
  1. x

細思極恐 [细-极-]

Jyutping
Pinyin xì sī jí kǒng

Definitions (CC-CEDICT)
  1. scary to think about (coll.) (coined c. 2013)