Etymology
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comme il faut

"according to etiquette," 1756, French, literally "as it should be." From comme "as, like, how," from Old French com, from Vulgar Latin *quomo, from Latin quomodo "how? in what way?," pronominal adverb of manner, related to quam "how much?," qui "who" (from PIE root *kwo-, stem of relative and interrogative pronouns). With il, from Latin ille "this" (see le) + faut, third person singular present indicative active of falloir "be necessary," literally "be wanting or lacking" (see fail (v.)).

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Definitions of comme il faut

comme il faut (adj.)
according with custom or propriety;
it is not comme il faut for a gentleman to be constantly asking for money
Synonyms: becoming / comely / decorous / seemly
From wordnet.princeton.edu