<p><strong>Verb:</strong></p><ul><li>(used with object) to remove a block or obstruction from: to unblock a channel; to unblock a person's credit.</li><li>Bridge: to play (a suit) so that the last card of the suit in one hand can provide access to the hand of the partnership having the longer holding in the suit.</li></ul><p><strong>Verb (used without object):</strong></p><ul><li>to use a dredge.</li></ul><p><strong>Verb Phrase:</strong></p><ul><li>to unearth or bring to notice: We dredged up some old toys from the bottom of the trunk.</li><li>to locate and reveal by painstaking investigation or search: Biographers excel at dredging up little known facts.</li></ul>