n. 25B6; noun a sheep pen : ENCLOSURE, fold, sheepfold, pound, compound, stockade; sty, coop; N. Amer. corral.
25B6; verb the hostages had been penned up in a basement : CONFINE, coop (up), cage, shut in, box up/in, lock up/in, trap, imprison, incarcerate, immure.