a support used to rest one's back.

1855–60; back1 + rest1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To backrest
Example sentences
It is also split, so each part can be folded separately, and its backrest can be reclined.
The seatback angles back slightly, making it more comfortable than the bolt-upright backrest found in some other pickups.
Adjust the tilt angle so that the backrest touches your back.
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