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A viewing or attendance of something before it is ready to be shown or released to the general public. Film journalists across the state were invited to a sneak preview of the new blockbuster in Hollywood. During the interview, I was given a sneak preview of the latest sculpture she's been working on.
An advance showing of something, as in It was supposed to be bad luck but she gave the bridegroom a sneak preview of her wedding gown . This expression originated in the 1930s for a single public showing of a motion picture before its general release, and in succeeding decades was transferred to other undertakings.