"bolsters" in the noun sense
1. bolster, long pillow
a pillow that is often put across a bed underneath the regular pillows
"bolsters" in the verb sense
1. bolster, bolster up
support and strengthen
"bolster morale"
2. bolster
prop up with a pillow or bolster
3. pad, bolster
add padding to
"pad the seat of the chair"
Source: WordNet® (An amazing lexical database of English)
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