A thing that is given free, often for promotional purposes. The company held a giveaway to promote their new product line.
A thing that makes an inadvertent revelation or disclosure. His nervous laugh was a giveaway that he was hiding something.
An event or promotion in which items are distributed free of charge. The radio station is hosting a holiday giveaway for its listeners.
An extremely inexpensive purchase or deal; a bargain. At just ten dollars, the concert ticket was an absolute giveaway.