I read from freezer burn to French dressing.

The phrase "pardon/excuse my French" came from people literally using french words in their speech, but not swear words. Seems like there's a number of possibilities why it's used for swear words.

https://en.wikipedia.org/wiki/Pardon_my_French

https://www.quora.com/Why-do-we-call-foul-language-French

The word of the episode is "fremitus".

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