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Jyutping bui3 dei6
Pinyin bèi dì

Definitions (CC-CEDICT)
  1. secretly
  2. in private
  3. behind someone's back
Definitions (Wiktionary)
  1. adv
    in secret; in private; surreptitiously; behind someone's back; privately; on the sly
    (syn.) 暗下裡, 私下里, 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, 私底下, 背後, 暗里, 暗地裡, 暗地里, 私自, 暗静, 尻川後, 暗下, 私下裡, 暗中, 背地裡
Examples (粵典–words.hk)
  1. Cantonese
    佢喺你面前赞你好有本事,但系背地里成日同人唱衰你㗎。
    佢喺你面前讚你好有本事,但係背地裏成日同人唱衰你㗎。
    • He praises your capability in your face but he often bad-mouth you behind your back.
Examples (Wiktionary)
  1. Mandarin
    别在背地里褒贬人。
    別在背地裏褒貶人。
    bié zài bèi dì lǐ bāo bian rén .
    • Don't speak ill of anybody behind this back.