word choice - What's the meaning of 'deflating mots' in this sentence?

I'm graduating in translation and one of my 2nd semester's works is a movie review about Philomena. I am stuck, however, at this part:

(He's an) expert purveyor of deflating mots on any subject, including his own atheism: “I don’t believe in God and I think He can tell.”

I don't understand what "deflating mots" means. What's the meaning of "mot" in that context?

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