「胸三寸に納めるつもりだ」

From what I've read, 「胸三寸」 literally translates to "heart, mind, and feelings"
and 「納める」roughly translates to "to pay" or "to put away".

This line is from 美味しんぼ
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2021-02-07T05:15:14.180
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2021-02-07T05:57:21.900
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question
translation words japanese-to-english
What is the real meaning behind 胸三寸?
[「寸{すん}」](https://ja.wikipedia.org/wiki/%E5%AF%B8)as standardized in the Meiji
era is about 3 cm in the International System of Units (SI.)

「胸三寸{むねさんずん}」means three 寸 (9 cm) into the chest, which is where the heart was
thought to be. 「胸三寸に納める」literally means "to put away deep in the chest". This
phrase according to
[デジタル大辞泉](https://dictionary.goo.ne.jp/word/%E8%83%B8%E4%B8%89%E5%AF%B8%E3%81%AB%E7%B4%8D%E3%82%81%E3%82%8B/)
means:

> 心の中にしまい込んで、顔にも言葉にも出さないでいる。胸三寸に畳む。「何もかも―・めておく」

Namely it means "to bury (feelings, thoughts) (in your heart)", "not to show
it on the outside".
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2021-02-07T05:57:21.900
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answer