n. 代替者( substitute的名词复数 ); 替补（运动员）; 替代物; [语法学]代用词

v. 代替, 替换, 代用( substitute的第三人称单数 ); 做…的代理人, 接替

n a person or thing that takes or can take the place of another

n an athlete who plays only when a starter on the team is replaced

n someone who takes the place of another (as when things get dangerous or difficult)

v put in the place of another; switch seemingly equivalent items

v be a substitute

v act as a substitute