n.
Pronunciation: ' ə n-d ə r- ˌ st ə -d ē , ˌ ə n-d ə r- '
Function: intransitive verb
Date: 1874
: to study another actor's part in order to substitute in an emergency
transitive verb : to prepare (as a part) as understudy also : to prepare as understudy to (as an actor)