An old rattletrap.
An example of a rattletrap is a heavily used and damaged 20 year old car that is still being driven.
- A mechanical device, particularly an automobile, that is worn out, run down, or mechanically unreliable as indicated by noises it makes in operation.
- Mom always worried about our safety in my friend's rattletrap. I told her not to worry, as it can't go fast enough to be dangerous.