/ ˈgɪvəweɪ; NAmE / noun , adjective
■ noun ( informal )
1.
something that a company gives free, usually with sth else that is for sale
2.
something that makes you guess the real truth about sth/sb :
She pretended she wasn't excited but the expression on her face was a dead (= obvious) giveaway .
■ adjective
[ only before noun ] ( informal ) ( of prices ) very low