au grand sérieux

French phrase
au grand sé·​rieux | \ ō-gräⁿ-sā-ryœ How to pronounce au grand sérieux (audio) \

Definition of au grand sérieux

: in all seriousness

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“Au grand sérieux.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/au%20grand%20s%C3%A9rieux. Accessed 20 Sep. 2020.

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