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)
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Merriam-Webster unabridged
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Time Traveler for bangtail
The first known use of bangtail was in 1887
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