The term "truckle-bed" refers to a bed that rolls underneath another bed, commonly used in small spaces or children's bedrooms. However, if you are looking for synonyms for this term, there are a few options available. One possible synonym is "bunk bed," which is a set of two or more beds, with one bed stacked on top of the other. Another synonym is "daybed," which is a bed that can be used as a sofa during the day and converted into a bed at night. Lastly, "sofa bed" is another synonym for truckle-bed, as it is a sofa that can be unfolded to become a bed.