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Jyutping daan1 soeng1 si1
Pinyin dān xiāng sī

Definitions (CC-CEDICT)
  1. one-sided lovesickness; unrequited longing
Definitions (Wiktionary)
  1. verb
    to have unrequited love
    (syn.) 悅單爿, 單戀, 單思, 單相思
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    “爱”是指两个人相互的爱,如果一个人单相思,那是一种病。
    “愛”是指兩個人相互的愛,如果一個人單相思,那是一種病。
    “ ài ” shì zhǐ liǎng gè rén xiàng hù de ài , rú guǒ yī gè rén dān xiāng sī , nà shi yī zhǒng bìng 。
    • Love is when both love mutually. When one loves is a disease.