to lock up, to coop up; to lock away, put away, to imprison, to nail (in a prison or mental hospital); to enclose, to confine, to immure; to contain, to hold, to include, to encapsulate, to entail; to stalemate
plug (a pronged connecting device which fits into a mating socket, especially an electrical one); socket, jack, electrical outlet (an opening into which a plug or other connecting part is designed to fit (e.g. a light bulb socket); connections (influence allowing one to obtain something, especially giving an unfair advantage over others)