The Collaborative International Dictionary of English v.0.48:
jailbreak \jailbreak\ n. an escape from jail; as, five prisoners escaped in a coordinated jailbreak. Syn: break, breakout, gaolbreak, prisonbreak, prison-breaking. [WordNet 1.5]WordNet (r) 3.0 (2006):
jailbreak n 1: an escape from jail; "the breakout was carefully planned" [syn: break, breakout, jailbreak, gaolbreak, prisonbreak, prison-breaking]