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Multiple Meanings
bolster — as in:  to bolster

So I’d grabbed a book for myself and propped up a row of pillows for Mia to bolster her leg against, like she liked to at night.
Gayle Forman  --  Where She Went
support and strengthen

As a noun, bolster can refer to any of a number of specific things that provide support — especially a long narrow pillow.
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