Topic: BUILDING
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ris‧er
[countable]
[countable]2 technicalTB the upright part of a step on a set of stairs
3 a set of wooden or metal steps that can be moved from place to place, used for a group of people to stand on :
The school choir stood on risers behind the orchestra.
risers
[plural] American English
The school choir stood on risers behind the orchestra.