嘥燈賣油 (saai1 dang1 maai6 jau4) — to work hard for nothing in Cantonese
saaiˉ¹嘥dangˉ¹燈maaiˍ₆賣jauˎ₄油简 嘥灯卖油
Mandarin Pinyin: sai1 deng1 mai4 you2
Meaning of 嘥燈賣油
nounto work hard for nothing
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