1425-75;late Middle Englishfaubourgh < Middle Frenchfau(x)bourg, alteration, by association with fauxfalse, of Old Frenchforsborc, equivalent to fors- outside of (< Latinforīs outside; cf. foreign) + borc city ≪ Germanic (see borough)
"suburb," 1470, from M.Fr. faux bourg, from O.Fr. forsbourc, lit. "that which is outside the town," from fors "outside" (from L. foris) + bourc "town," of Frank. origin (cognate with Eng. borough). Alt. in M.Fr. by folk-etymology to faux bourg "false town" (suburbs looked on as inauthentic).