parley (n.)

"allegorical or metaphorical narrative, usually having a moral for instruction," late 13c., parabol, modern form from early 14c., "saying or story in which something is expressed in terms of something else," from Old French parable "parable, parabolic style in writing" (13c.), from Latin parabola "comparison," from Greek parabolē "a comparison, parable," literally "a throwing beside," hence "a juxtaposition," from para- "alongside" (see para- (1)) + bolē "a throwing, casting, beam, ray," related to ballein "to throw" (from PIE root *gwele- "to throw, reach").

Rendered in Old English as bispell. In Vulgar Latin, parabola took on the meaning "word," hence Italian parlare, French parler "to speak" (see parley (n.)).

1570s, "speaking, speech," especially in debate; 1787 as "way of speaking, manner of expression," from Anglo-French (c. 1300) and Old French parlance, from Old French parlaunce, from parler "to speak" (see parley). In common parlance means "in ordinary language."