detention
noun uk/dɪˈten.ʃən/ us/dɪˈten.ʃən/
[ U ]拘留，关押
the act of officially detaining someone
Concern has been expressed about the death in detention of a number of political prisoners. 人们对一些政治犯在关押期间死去表示关注。
[ C or U ]（作为惩罚）放学后留校
a form of punishment in which children are made to stay at school for a short time after classes have ended
She's had four detentions this term. 这学期她4次被罚课后留下。