低聲細語 [－声细语]

Jyutping dai1 sing1 sai3 jyu5
Pinyin dī shēng xì yǔ

Definitions (CC-CEDICT)
  1. in a whisper
  2. in a low voice (idiom)
Definitions (Wiktionary)
  1. phrase, idiomatic
    in a low voice; whisper