D defs.my
Entry 2 senses · 2 variants Webster, 1913

Understudy

/ŭn'-dẽrs-tŭdˌ-ē/ · Un·der·stud·y · IPA /ˈʌndɚstʌdi/
01 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.
  1. 1.
    To study, as another actor's part, in order to be his substitute in an emergency; to study another actor's part.(Theater)
02 n. One who studies another's part with a view to assuming it in an emergency.
  1. 1.
    One who studies another's part with a view to assuming it in an emergency.