夏か炉ろ冬とう扇せん

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Meanings

noun

summer fires and winter fans; useless things

yojijukugo (four-character idiom)

A yojijukugo describing something that is out of season and therefore useless, like a heater in summer or a fan in winter. Often used metaphorically for things that are untimely or of no practical value.

彼かれの提てい案あんは夏か炉ろ冬とう扇せんのようなものだ。
His proposal is like a summer fire or a winter fan—completely useless.