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A rest or support for the back.
a support for one's back.
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|Noun||1.||backrest - a support that you can lean against while sitting; "the back of the dental chair was adjustable"|
cantle - the back of a saddle seat
car seat - a seat in a car
chair - a seat for one person, with a support for the back; "he put his coat over the back of the chair and sat down"
ladder-back - the backrest of a chair that consists of two uprights with connecting slats
support - any device that bears the weight of another thing; "there was no place to attach supports for a shelf"