Definition:
A "detention centre" is a place where people are kept for a short time. This can include people who are waiting for a trial (a legal process to find out if someone is guilty of a crime), people who are seeking asylum (refugees looking for safety), or people who do not have permission to stay in a country (illegal immigrants).
In legal discussions or news articles, you might encounter phrases like "immigration detention centre" or "juvenile detention centre," which specify the type of people being held there.
While "detention centre" primarily refers to a place of temporary confinement, "detention" can also refer to being held back in school as punishment for misbehavior.
While there are no popular idioms specifically related to "detention centre," you might hear the phrase "in detention," which means someone is being kept in a place, often as a punishment.
A "detention centre" is a place for temporarily holding individuals, often related to legal or immigration matters. It is different from a prison, which is for long-term confinement.