society > travel > means of travel > a conveyance > vehicle > cart, carriage, or wagon > parts of cart or carriage > [noun] > body > support for bed (2)
Applied to various parts of mechanism which form a solid support or base, on which other parts rest… The transverse bar over the axle of a wagon…
A block or bearing. A wooden crosspiece which supports the beam of a plough or the bed of a wagon; cf. bolster, n.1 2e 3a. Now historical.