/ ˈslʌmbə(r); NAmE / noun , verb
■ noun
[ U , C , usually pl. ] ( literary ) sleep; a time when sb is asleep :
She fell into a deep and peaceful slumber.
➡ note at sleep
■ verb
[ v ] ( literary ) to sleep
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WORD ORIGIN
Middle English : alteration of Scots and northern English sloom , in the same sense. The -b- was added for ease of pronunciation.