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Jyutping si1 jyu5
Pinyin sī yǔ

Definitions (CC-CEDICT)
  1. to discuss in whispered tones
  2. whispered conversation
Definitions (Wiktionary)
  1. verb, literary
    to whisper; to talk in hushed tones
  2. noun
    secret talk; confidences
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    男孩们窃窃私语,我知道他们准备做些什么。
    男孩們竊竊私語,我知道他們準備做些什麼。
    nán hái men qiè qiè sī yǔ , wǒ zhī dào tā men zhǔn bèi zuò xiē shén me 。
    • The boys were whispering; I knew they were up to something.
  2. Mandarin
    他窃窃私语。
    他竊竊私語。
    tā qiè qiè sī yǔ 。
    • He spoke under his breath.