A docked tail of a horse or dog.
- ‘Also, unlike cheetahs and lions (which have long tails that help provide balance when the animals run) Smilodon had a bobtail.’
Cut short; abbreviated.‘the bobtailed 1995 baseball season’
Mid 16th century: probably from bob + tail. It was originally recorded as a humorous term for a kind of broad-headed arrow, probably because it looked as though it had been cut short.