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Douglas Harper's Etymology Dictionary
slug-a-bed

also slugabed, 1590s, with bed (n.) + obsolete verb slug "be lazy, intert" (early 15c.), which is perhaps from Scandinavian (see sluggard).

Wiktionary
slug-a-bed

n. (alternative spelling of slugabed English)

Usage examples of "slug-a-bed".

So she left that old slug-a-bed Wendall Tufts in Brockville and highed off south with little Stanley.