To study or know a role to such an extent as to be able to replace the normal performer when required. / To act as an understudy (to someone). / To act in a similar manner to some known person.

A performer who understudies; a standby.

present participle of understudy

Insufficiently studied.

simple past tense and past participle of understudy

plural of understudy

Third-person singular simple present indicative form of understudy