understudy

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understudy

an actor or actress who studies a part so as to be able to replace the usual actor or actress if necessary
References in periodicals archive ?
Crossley is keen to move on after spending two years understudying Edwin Van Der Saar and his chances have been improved by the signing of Czech stopper Jaroslav Drobny from Greek club Panionios.
I was understudying the role Hyman was playing, and George Fisher was also understudying the same role.
He made his Broadway debut in 1963, understudying Herschel Bernardi in "Bajour"