<p><strong>Verb (used without object)</strong></p><ul><li>sneaked or snuck, sneaking: to go in a stealthy or furtive manner; slink; skulk.</li><li>Synonyms: steal</li><li>to act in a furtive or underhand way.</li><li>British Informal: to tattle; inform.</li></ul><p><strong>Verb (used with object)</strong></p><ul><li>sneaked or snuck, sneaking: to move, put, pass, etc., in a stealthy or furtive manner: He sneaked the gun into his pocket.</li><li>to do, take, or enjoy hurriedly or surreptitiously: to sneak a cigarette.</li></ul><p><strong>Noun</strong></p><ul><li>a sneaking, underhand, or contemptible person.</li><li>Informal: a stealthy or furtive departure.</li><li>British Informal: tattletale; informer.</li><li>sneaker (def 1).</li><li>Informal: a sneak preview.</li><li>Cards: the lead of a singleton in a suit other than the trump suit, as in whist.</li></ul>