noun

a covered walk in a convent, monastery, college, or cathedral, typically with a colonnade open to a quadrangle on one side.

the shadowed cloisters of the convent

walkway,covered walk,corridor,aisle,arcade,loggia,gallery,piazza,colonnade,ambulatory,stoa

verb

seclude or shut up in a convent or monastery.

the monastery was where the Brothers would cloister themselves to meditate

confine,isolate,shut away,sequester,seclude,closet