Borrowed from French savoir-faire, from savoir ("to know (how)") + faire ("to do").

• (RP) IPA: /ˌsævwɑːˈfɛə/
• (America) IPA: /ˌsævwɑɹˈfɛɹ/

savoir-faire (uncountable)

1. The ability to do or say what is appropriate for the occasion.
   • 1917, H[erbert] G[eorge] Wells, chapter IX, in The Soul of a Bishop‎:

     Dr. Brighton-Pomfrey had the savoir-faire of a successful consultant; he prided himself on being all things to all men; but just for an instant he was at a loss what sort of thing he had to be here.

• know-how