intransitive. Of a motor car: to travel at a slow speed, esp. as a result of a mechanical fault; to crawl.

intransitive. colloquial. Of a motor vehicle, trailer, etc.: to judder slightly or veer momentarily sideways, esp. when travelling at high speed…

Of an aircraft or motor vehicle: to cruise along in a leisurely manner, usually at low speed. colloquial (originally R.A.F. slang).