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Jyutping waan4 kap1 lou5 si1
Pinyin huán gěi lǎo shī

Definitions (Wiktionary)
  1. verb, idiomatic
    to forget everything one has learnt
    (syn.) 还畀老师, 畀返老師, 還畀老師, 畀返老师
    • 我發現我的英語都還給老師了。
      我发现我的英语都还给老师了。
      wǒ fā xiàn wǒ de yīng yǔ dōu huán gěi lǎo shī le .
      I found out that I have forgotten all the English I have learnt.

還給老師 [还给-师]

Jyutping
Pinyin huán gěi lǎo shī

Definitions (CC-CEDICT)
  1. to forget (everything one has learned)
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    我把成语全部还给老师了。
    我把成語全部還給老師了。
    wǒ bǎ chéng yǔ quán bù huán gěi lǎo shī le 。
    • I gave all of the Chinese proverbs back to the teacher.
Examples (Wiktionary)
  1. Mandarin
    我发现我的英语都还给老师了。
    我發現我的英語都還給老師了。
    wǒ fā xiàn wǒ de yīng yǔ dōu huán gěi lǎo shī le .
    • I found out that I have forgotten all the English I have learnt.