ETYMOLOGY
from Middle English roboraten, from Latin roboratus,
past participle of roborare (to strengthen, confirm),
from robor-, robur (strength)
EXAMPLE
“…This pope roborate the sentence of excommunicacion ageyne Frederyke the emperoure…”
From: Ranulf Higden’s Polychronicon
Translated by John Trevisa, a1475
Lexicophilia 