the.com/trundle bed

A bed with a spare bed hiding underneath, for guests you only half-expected.

means A low bed on wheels or casters that stores underneath a taller bed and rolls out when extra sleeping space is needed.

from From 'trundle,' meaning to roll or spin along on small wheels — related to 'trend' and 'trundle' as a verb for rolling heavy objects, traceable to Old English roots tied to turning or revolving. The bed earned its name simply because it literally trundles: it's pulled out from its hiding spot on little casters, rolling across the floor like a small, obedient cart.

origin
named for wheels that let it roll out
also called
truckle bed in older British usage
historical use
servants once slept on them, low to the ground
space logic
turns one room into two sleeping spots
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