The term is attested in Limousin (FEW segear) and the present attestation may reflect a local borrowing in the document, an endenture between Johan de Nevill and the constable of Bordeaux.
v.a.
1to saw, cut (wood):
(
1381
)
paié a .v. seguadours pur seguar fuste, pur la dit chat =movable penthouse, par .viij. jours
iv 131
seguar (1381)