Bible Dictionaries
Understudy

Webster's Dictionary

(1):

(v. t. & i.) To study, as another actor's part, in order to be his substitute in an emergency; to study another actor's part.

(2):

(n.) One who studies another's part with a view to assuming it in an emergency.

Bibliography Information
Webster, Noah. Entry for 'Understudy'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​u/understudy.html. 1828.