Denotes a person or thing serving as a substitute or temporary replacement.
When the drummer fell ill, a fill-in was hired for the tour.
Когда барабанщик заболел, для тура наняли заместителя.
The producers ran a series of reruns as a fill-in until the new season was ready.
Продюсеры показывали серию повторов в качестве замены, пока новый сезон не был готов.
Used attributively to describe something or someone acting as a substitute.
She worked as the fill-in anchor during the holidays.
Во время праздников она работала замещающей ведущей.