悪貨は良貨を駆逐する
Idiom- 1when there is a legal tender currency, bad money drives out good money (Gresham's Law) Translated by Jiyomi
Other writings and readings
あくかはりょうかをくちくする
expressions (phrases, clauses, etc.) · suru verb - included
JMdict entry 1929200. Source and licence.