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Jyutping si1 haa6 leoi5
Pinyin sī xià lǐ

Definitions (Wiktionary)
  1. adv
    in secret; in private; surreptitiously; behind someone's back; privately; on the sly
    (syn.) 暗下裡, 暗地, 暗靜, 暗下里, 尻脊后, 私下, 尻脊後, 背地里, 背后, 暗裡, 尻川后, 背地, 私底下, 背後, 暗里, 暗地裡, 暗地里, 私自, 暗静, 尻川後, 暗下, 暗中, 背地裡