前震 [－－]

Jyutping cin4 zan3
Pinyin qián zhèn

Definitions (粵典–words.hk)
  1. 名詞
    大​地震​前​比​較​輕​微​嘅​地震​，​繼以​ ​主震
    foreshock
Definitions (Wiktionary)
  1. noun
    foreshock