The phrase 'tête-à-tête' is a direct borrowing from French, where it literally means "head-to-head." It entered English in the late 17th century, retaining its original French spelling and hyphens. The term vividly captures the image of two people in intimate, confidential conversation, their heads close together. This concrete, spatial metaphor evolved into the modern abstract meanings denoting both the private conversation itself and the manner in which it is conducted.

This is a loan phrase from French. It is not productively segmented into separate English morphemes. The phrase functions as a lexical unit.