verb, -stud⋅ied, -stud⋅y⋅ing, noun, plural -stud⋅ies.| 1. | to learn (a role) in order to replace the regular actor or actress when necessary. |
| 2. | to act as understudy to (an actor or actress): to understudy the lead. |
| 3. | to act or work as an understudy. |
| 4. | a performer who learns the role of another in order to serve as a replacement if necessary. |