stand-in
1 of 2noun
ˈstand-ˌin 
1
: someone employed to occupy an actor's place while lights and camera are readied
2
: substitute
stand in
2 of 2verb
stood in; standing in; stands in
intransitive verb
: to act as a stand-in
Synonyms
Noun
- backup
- cover
- designated hitter
- fill-in
- locum tenens
- pinch hitter
- relief
- replacement
- reserve
- sub
- substitute
Verb
- cover
- fill in
- pinch-hit
- step in
- sub
- substitute
- take over
See all Synonyms & Antonyms 
Example Sentences
Verb she will be standing in for the regular teacher for a week
Word History
First Known Use
Noun
circa 1928, in the meaning defined at sense 1
Verb
1904, in the meaning defined above