Question of the Day #402

"Jordyn and Kylie used to be thick as thieves until the curve model was seen kissing Tristan Thompson– Kylie’s sister’s then-boyfriend."
From the first paragraph of this article at stylecaster.com.

上記の文で、thick as thieves の意味は？
In the sentence above, what does "thick as thieves" mean?

答えは、コメントに書いてください。
Write your answer in the Comments.

明日、ここに答えを書きます。
I will add the answer and other remarks here tomorrow.

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解答

意味：
英辞郎によるとas thick as thievesの意味は、


《be ～》〔秘密を共有するほどに〕とても親しい間柄である

ただし、問題文にあるように必ずしも最初のasは必要ありません。

Answer

According to Merriam-Webster:

very close and secretive

Etymology/語源

The Phrase Finderによると、

私が発見した最も古い印刷例は、1828年2月に出版されたイギリスの新聞The Morning Chronicle紙に掲載された1827年3月の手紙にあった下記の文です。

Bill Morris and me are as thick as two thieves.

また、このリンクにはもっと詳しい説明がありますので参照してください。

According to The Phrase Finder:

The first example that I can find of it in print is from the English newspaper The Morning Chronicle, in a letter dated March 1827, published in February 1828:

Bill Morris and me are as thick as two thieves.

This link also includes a more in-depth explanation of the phrase.

Examples

• They were (as) thick as thieves for weeks, which made us wonder what they were doing.
• I'm sure she tells Ruth everything we say - they're as thick as thieves, those two.
• Anna and Beth are together all the time these days—they're as thick as thieves.
• The guys who work in the warehouse are thick as thieves. They don't really socialize with anyone else in the company.
• Those two families are thick as thieves.