From Middle English bolster, bolstre, from Old English bolster, from Proto-West Germanic *bolstr, from Proto-Germanic *bulstraz. Cognate with Scots bowster ("bolster"), West Frisian bulster ("mattress"), Dutch bolster ("husk, shell"), German Polster ("bolster, pillow, pad"), Swedish bolster ("soft mattress, bolster"), Icelandic bólstur ("pillow").
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