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Jyutping maai6 gwaai1
Pinyin mài guāi

Definitions (Wiktionary)
  1. verb
    to pretend to feel wronged
  2. verb
    to be sharp but petty-minded; to show off one's cleverness
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)

賣乖 [卖-]

Jyutping
Pinyin mài guāi

Definitions (CC-CEDICT)
  1. to show off one's cleverness
  2. (of sb who has received beneficial treatment) to profess to have been hard done by