1a substitute
2a replacement
3to replace (a damaged component with a new one, an injured player with a substitute player, full-time workers with casual workers etc)
Examples
yóu yú由于xùn liàn训练chí dào迟到，jié杰kè克de的jiào liàn教练jué dìng决定bǎ把tā他liú留zài在tì bǔ替补xí席。
由于训练迟到，杰克的教练决定把他留在替补席。
Jack’s coach decided to keep him on the bench for being late to training.
当亚历克斯·弗格森看到自己的球员劳累时，他总是叫替补上场。
When Sir Alex Ferguson saw that his players were getting tired, he always substituted them.