surcingle UK /ˈsɜːsɪŋɡ(ə)l/US /ˈsɜɹˌsɪŋ.ɡəl/noun 3verb 1forms 3 noun3 •A long unpadded strap to pass over and keep in place a blanket, pack or saddle on an animal. •A piece of tack wrapped around the belly of a horse, to use when longeing. •A girdle to fasten a garment, especially a cassock. verb1 •To fasten with a surcingle. formssurcingled · surcingling · surcingles