“The word for the bed that rolls under another bed comes from the Old English for 'wheel' — the same root that gives us 'trundle' in 'trundle along.'”
Trundle comes from Middle English trendle, from Old English trendel (a circle, a ring, a wheel), related to trendan (to turn, to revolve). The word's original meaning was purely about circular motion. A trendel was any round, rolling thing. Applied to a bed, it named the small wheels or casters that allowed a low bed to be rolled beneath a larger one for storage during the day.
The trundle bed solved a space problem in medieval and early modern houses. Rooms served multiple functions — the same space might be a sitting room by day and a sleeping chamber by night. Servants, children, and guests slept on trundle beds that rolled out from under the main bed when needed and disappeared again in the morning. The trundle bed was literally a hidden bed, a secret revealed only at nightfall.
Tudor and Stuart inventories list trundle beds (also called 'truckle beds,' from the same root) as standard household items. The word 'truckle' acquired a figurative meaning: to truckle to someone was to sleep in the lower, servant's bed — to be subordinate. 'Truckling' still means obsequious submission in English. The furniture's hierarchical position — underneath — became a metaphor for social status.
Modern trundle beds are marketed for children's rooms and guest rooms. The casters that gave the bed its name have been replaced by smooth glides on hardwood and metal frames. The bed still rolls. The word still names the rolling. But the hierarchy — master above, servant below — has been stripped from the furniture. The subordination lives only in the word 'truckle.'
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Today
The trundle bed is a standard product at every major furniture retailer. Most are designed for children — a main bed for the child and a trundle for sleepovers. The social hierarchy that the original trundle bed encoded — master above, servant below — has been entirely erased. The subordination now exists only in the obsolete verb 'to truckle.'
The word still means to roll. Wheels trundle. Wagons trundle. Luggage trundles through airports. The bed trundled out and trundled back. The motion was the name. It still is.
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