The voters targeted by caging are often the most vulnerable: soldiers deployed overseas, those who are unfamiliar with their rights under the law, and those who cannot spare the time, effort, and expense of proving that their registration is valid. On the day of the election, when the voter arrives at the poll to request a ballot, an operative of the party challenges the validity of their registration. Ultimately, caging works by dissuading a voter from casting a ballot, or by ensuring that they cast a provisional ballot, which is less likely to be counted.
may also be used in abbreviation such as to cage
Callum - Just gonna finish my beer then will be caging
Kieron - whats the plan
Callum - Im gonna shag her best mate then cage