Definition of bangtail
1
US, dated slang
: racehorse
- That thoroughbred will leave the other bangtails standing still.
- —The American Girl
2
: a detachable slip attached to the flap or back panel of an envelope
- A bangtail is the perforated coupon attached to the body of a return envelope, which must be torn off before the envelope is sealed.
- —The Times-Union (Albany, New York)
