substitute

英 ['sʌbstɪtjuːt] 美['sʌbstɪtut]

• n. 代用品；代替者
• vi. 替代
• vt. 代替

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

2. an athlete who plays only when another member of the team drops out

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

"the star had a stand-in for dangerous scenes"

"we need extra employees for summer fill-ins"