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Jyutping pin1 fo1
Pinyin piān kē

Definitions (CC-CEDICT)
  1. to overemphasize some topic (at the expense of others)
  2. overdoing it
  3. to go overboard
Definitions (Wiktionary)
  1. verb, of a student
    to be interested in, or do well in one specific subject in school, to the neglect of others; to favour one subject over the others
Definitions (Kaifangcidian)
  1. (沒有對應漢語詞彙)