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Jyutping jat1 wong5 cing4 sam1
Pinyin yī wǎng qíng shēn

Definitions (CC-CEDICT)
  1. deeply attached
  2. devoted
Definitions (CC-CANTO)
  1. (idiom) In love (with someone) with one heart
Definitions (粵典–words.hk)
  1. 語句
    對人​或事物​放​咗​好​深​嘅​感情
    to fall deeply in love or to be passionately devoted
    • 雖然我對佢一往情深,但佢一啲都冇畀我感動。
      虽然我对佢一往情深,但佢一啲都冇畀我感动。
      seoi1 jin4 ngo5 deoi3 keoi5 jat1 wong5 cing4 sam1, daan6 keoi5 jat1 di1 dou1 mou5 bei2 ngo5 gam2 dung6.
      I am passionately devoted to her but she has never been touched.
Definitions (Wiktionary)
  1. phrase, idiomatic
    to have a deep and abiding affection for; to be passionately devoted (to something, once one starts to pour one's feelings to it); to be passionately in love
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (粵典–words.hk)
  1. Cantonese
    虽然我对佢一往情深,但佢一啲都冇畀我感动。
    雖然我對佢一往情深,但佢一啲都冇畀我感動。
    seoi1 jin4 ngo5 deoi3 keoi5 jat1 wong5 cing4 sam1, daan6 keoi5 jat1 di1 dou1 mou5 bei2 ngo5 gam2 dung6.
    • I am passionately devoted to her but she has never been touched.