atreguar

An archaic verb meaning to grant a tregua (truce) or brief respite to an enemy or a hardship — largely confined to old chronicles and literary Spanish today. Modern speech just uses dar tregua a.

• El rey atreguó a sus enemigos por unos días. — The king granted his enemies a truce for a few days.
• La enfermedad no lo atreguaba ni de noche. — The illness gave him no respite even at night.
• Atreguaron las hostilidades hasta la primavera. — They granted a truce to the hostilities until spring.

Using atreguar in modern conversation expecting to be understood naturally — it reads as archaic or literary; dar tregua a is what a contemporary speaker actually says.