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

 

bolster

 noun
noun
BrE BrE//ˈbəʊlstə(r)//
 
; NAmE NAmE//ˈboʊlstər//
 
 
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a long thick pillow that is placed across the top of a bed under the other pillows Word Origin Old English, of Germanic origin; related to Dutch bolster and German Polster.
See the Oxford Advanced American Dictionary entry: bolster

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