an act or instance of giving something away.
something that is given away, especially as a gift or premium: A pocket calculator was offered as a giveaway with every new subscription to the magazine.
a radio or television program on which prizes are given away to contestants in a question-and-answer game.
a tax law or other legislation designed to benefit one segment of the population, one area or state, etc.: a giveaway that benefited only the very rich.
an unscrupulous deal, especially one that benefits some while defrauding others.
Sports. any careless loss of possession of a ball, puck, etc., or other offensive lapse that leads to a score by the opponent.
constituting a giveaway: a giveaway newspaper.

1870–75, Americanism; noun use of verb phrase give away Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Slang Dictionary

giveaway definition

  1. n.
    something that reveals a fact that was meant to be concealed. (Often with dead.) : The way he was walking was a giveaway to the fact that he was the one who was injured.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
Get inside info on our latest shows, fun facts you can share with friends and
  the occasional giveaway.
The premolars are a giveaway, with a root much different from ours.
But thanks to our latest giveaway, a few readers can enjoy it for free.
Many more changed their names, clothing and other giveaway features of their
  ancestry to escape persecution.
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