backing
n. · adj. US //ˈbækɪŋ// UK //bˈækɪŋ// back·ing
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1 protective layer (n.) C1 Advanced Technicala layer of material that is put on the back of something to protect it or make it stronger.
a layer of material forming the back of something, often for reinforcement, insulation, or protection.
ExampleThe carpet has a thick rubber backing to stop it from sliding on the floor.
ExampleThe photograph was mounted on an acid-free card backing to ensure its long-term preservation within the frame.
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2 supporting a performer (adj.) B2 Upper Intermediate Musicdescribing people or things that provide support for a main performer.
functioning as accompaniment or support for a primary subject or performer.
ExampleShe started her career as a backing singer for a famous rock band.
ExampleThe backing track was recorded separately in a high-end studio before the lead vocalist added her contribution.
From back + -ing.