[f. next.] An actor or actress who studies a superior performers part in order to be able to take it if required; also, the study of a part for this purpose. Also transf.
1882. Society, 7 Oct., 13/2. His place during his absence having been filled by his understudy.
1884. G. Moore, Mummers Wife (1887), xv. 196. The girl who had been entrusted with the understudy.
1887. Lang, Myth, Ritual & Relig., I. 336. There is a tendency for gods to double their parts, or rather,.. for each part to have its under-study.