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Definition of bolster noun from the Oxford Advanced Learner's Dictionary

bolster

noun
 
/ˈbəʊlstə(r)/
 
/ˈbəʊlstər/
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  1. a long thick pillow that is placed across the top of a bed under the other pillows
    Word OriginOld English, of Germanic origin; related to Dutch bolster and German Polster.
See bolster in the Oxford Advanced American Dictionary

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