The idiom "sound as a roach" is thought to have originated in the 18th century. It is believed to be a reference to the fact that cockroaches are very resilient creatures. They can survive in a variety of harsh environments, and they are very difficult to kill. As a result, they came to be seen as a symbol of good health and vitality.

英語での「(as) sound as a roach」の定義と意味

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