Meaning & usage
In the examples, よし appears in the set pattern よしなさい, a firm instruction telling someone to stop doing something, built from the verb よす after a noun phrase; よしてもらいたい likewise means the speaker wants the action stopped. The phrase 知る由もなかった uses 由 to mean there was no way of knowing. Both uses are formal.
Example sentences 8
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「あの赤い服を着るのはよしなさい」「なぜいけないの」
"You had better not wear the red dress." "Why not?"
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ひっきりなしに電話をかけることはよしてもらいたい。
I don't want you to ring me up all the time.
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ばかなまねをするのはよしなさい。皆さんに笑われますよ。
Stop making a fool of yourself. Everyone is laughing at you.
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まさかこんなことが起きようとは、トムには知る由もなかった。
Tom had no way of knowing that this would happen.
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過去の失敗をくよくよ考えるのはよしなさい。
Don't dwell on your past mistakes!
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彼がどこへ行ってしまったか知る由もない。
There is no way of knowing where he's gone.
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人の問題に鼻を突っ込むのはよしてくれよ。
Stop sticking your nose into other people's business.
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あえて意見を述べることはよしておこう。
I will not presume to give an opinion.