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Jyutping bui3 dei6 leoi5
Pinyin bèi dì li

Definitions (粵典–words.hk)
  1. 副詞、書面語
    背著​人​哋​做​一​啲​嘢​,​例如​篤​背脊
    to do something behind one's back; privately
    • 佢喺你面前讚你好有本事,但係背地裏成日同人唱衰你㗎。
      佢喺你面前赞你好有本事,但系背地里成日同人唱衰你㗎。
      He praises your capability in your face but he often bad-mouth you behind your back.
  2. 參看
    暗地裏
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.