a heavy two-wheeled or four-wheeled vehicle used for transporting loads
a lightweight two-wheeled vehicle drawn by a horse, pony, or dog
a small wheeled vehicle
NAmer a supermarket trolley
in the cart
in a difficult situation
put the cart before the horse
to do things in the reverse of the normal order
[Middle English, prob from Old Norse kartr; related to Old English cradol cradle1]