bobtail

noun

1. A short, or deliberately shortened tail.
2. An animal that has a bobtail, such as certain canines or nags.
3. A tractor which performs without its trailer.
4. A tractor-trailer that is relatively short in length.
5. A tractor-trailer that is relatively short in length.
6. (attributive, often)An open-ended straight or four flush.

   “a bobtail flush”

7. A bobtail squid.
8. A bobtail skink.

verb

1. To drive a tractor without its trailer.

   “2002. David Diamond. The Trucker & The Professor, Wired (magazine), Issue 9.12http://www.wired.com/wired/archive/9.12/sheffi.html?pg=2&topic=&topic_set= He deposits his trailer at a Marten facility in nearby Stockton, and then drives without the trailer - that's called "bobtailing".”

2. To drive a truck or other vehicle without its trailer.

   “2003. Bergmann Co. Bergmann's Cleaning History:https://web.archive.org/web/20071012131035/http://bergmanns.com/company_history.asp W.C. Bergmann was supplementing his meager lamplighter's income by "bobtailing"… picking up laundry and cleaning in his horse drawn truck...”