comme il faut

Borrowed from French comme il faut (literally “as is necessary, as must be”).

• (General American) IPA^(key): /ˌkʌmilˈfoʊ/
• (Received Pronunciation) IPA^(key): /ˌkʌmiːlˈfəʊ/

comme il faut (comparative more comme il faut, superlative most comme il faut)

1. Proper; in keeping with etiquette or social standards.
   • 1838 (date written)​, L[etitia] E[lizabeth] L[andon], chapter XXIII, in Lady Anne Granard; or, Keeping up Appearances. […], volume I, London: Henry Colburn, […], published 1842, →OCLC, page 296:

     "Georgiana, put on your blue muslin, and ask Fanchette to make your hair a little comme-il-faut; and pray try to look well and cheerful; you were not up late, and ought to appear the better for it."

   • 2007: Talking during performances is perfectly comme il faut in Wharton – why else go to a show if not to talk to one’s friends? – so while Miss Shaw, up to her bosom in dirt, went on about existence, I asked my female companion for advice. — Deborah Friedell, ‘Short Cuts’, London Review of Books 29:5

• IPA^(key): /kɔm il fo/

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comme il faut

1. properly (the way it should be done)

See falloir. Only conjugated in the third person singular.