n. A mechanical device, particularly an automobile, that is worn out, run down, or mechanically unreliable as indicated by noises it makes in operation.
the GNU version of the Collaborative International Dictionary of English
n. Any machine or vehicle that does not run smoothly.
The Century Dictionary and Cyclopedia
n. A shaky, rattling object; especially, a rattling, rickety vehicle; in the plural, objects clattering or rattling against each other.
Word Usage
"It must reward them, or their children would not be able to go to school, nor would so many of them be able to drive by in rattletrap, second-hand buggies or in stout light wagons."