Chinese

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to use advance; enter; to come in abolish; crippled
retreat; to decline; to move back
retreat; to decline; to move back; to withdraw
 
trad. (用進廢退) 退
simp. (用进废退) 退

Pronunciation

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Idiom

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用進廢退

  1. use and disuse; use it or lose it
    語言學習根本法則用進廢退 [MSC, trad.]
    语言学习根本法则用进废退 [MSC, simp.]
    Yǔyán xuéxí de gēnběn fǎzé shì yòngjìnfèituì. [Pinyin]
    A fundamental rule of language learning is: Use it, or lose it.