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Jyutping sam1 fong1
Pinyin xīn huāng

Definitions (CC-CEDICT)
  1. to be flustered
  2. (dialect) irregular heart-beat
Definitions (Wiktionary)
  1. adj
    panicked; alarmed; flustered; nervous
  2. verb
    to palpitate; to skip a beat (of one's heart); to suffer from an irregular heartbeat
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Definitions (HSK3.0)
  1. HSK3 七一九级词汇表 #4602
Examples (粵典–words.hk)
  1. Cantonese
    有时突如其来嘅问题会令人心慌意乱,但遇到问题时要平心静气去解决。
    有時突如其來嘅問題會令人心慌意亂,但遇到問題時要平心靜氣去解決。
    • X
Examples (Wiktionary)
  1. Mandarin
    这时候的心情主要已不是欣赏风景,而是有点心慌懊恼失误了:因为我一身薄裙就出发了,随身带的仅一条便裤一件体恤。
    这时候的心情主要已不是欣赏风景,而是有点心慌懊恼失误了:因为我一身薄裙就出发了,随身带的仅一条便裤一件体恤。
    From : 2018 , 爾雅 , 《 陽光如賒 : 寫意舊金山 》 , pa ge 112
    • At this point, I wasn't mainly enjoying the scenery so much as feeling panicked and frustrated, because I set off in just a thin dress, carrying only a pair of pants and a T-shirt.