noun. an escape from jail.
1. Verb, non-3rd person singular present When you jailbreak your device, the unapproved apps you install have the power to read and write anywhere on the device. 2. Noun, singular or mass For most cows, a single jailbreak would be plenty exciting. 3. Verb, base form If you have jailbroken your phone -- or worse, let someone jailbreak it for you -- it may be impossible to determine if you are being spied on.