[-]

Jyutping si1 seon3
Pinyin sī xùn

Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. noun, Hong-Kong, Taiwan
    private message
  2. verb, Hong-Kong, Taiwan
    to send a private message to
    (syn.) 私信

私訊 [-讯]

Jyutping
Pinyin sī xùn

Definitions (CC-CEDICT)
  1. (Tw) private message
  2. to send a private message
Examples (Wiktionary)
  1. Mandarin
    寄送私讯/寄送私讯
    寄送私訊/寄送私讯
    jì sòng sī xùn
    • to send PMs