To lie down to sleep for the night, usually of livestock or machinery.(verb)
To put an animal to rest for the night.(verb)
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Use "bed down" in a sentence
"The following year, Robert Altman's M*A*S*H, extremely popular with college students because it appeared to be antiwar, starred Elliott Gould and Donald Sutherland as martini-drinking army doctors who are contemptuous of any woman who even hesitates to bed down with them."
"Fortunately, the old man seemed to have taken to me; he wrung my hand fiercely at parting - he and Jerry were staying at a hotel in Concord, but Joe and I were to bed down in Sanborn's attic - and assured me that as soon as he'd finished his work in Boston, the two of us would start to plan "the campaign", as he called it."
"Mid-season, he'll bed down with a pre-op transgender receptionist named Kyla before contemplating a full same-sex encounter."