sin bin

UK: /ˈsɪnbɪn/

Collins Concise English Dictionary © HarperCollins Publishers::

sin bin, sin-bin noun

1. (in ice hockey, rugby, etc) an area off the field of play where a player who has committed a foul can be sent to sit for a specified period
2. a special unit on a separate site from a school that disruptive schoolchildren attend until they can be reintegrated into their normal classes