Earlier quoted context omitted.
Well, that’s unsurprising; nobody can know every expression in any language, even their native one. https://www.merriam-webster.com/dictionary/joie%20de%20vivre
Surprising to me. I’m an avid reader of books and news and movie watcher and I’ve never heard this phrase once. I also took 3 years of French, went to a 4 year college and I’ve reviewed lists of foreign phrases commonly used in English with my kids, all while somehow dodging this phrase for ~40 years!
This one’s on you. Here’s a helpful list: https://en.m.wikipedia.org/wiki/Glossary_of_French_expressio...