Vail \Vail\, v. t. [Aphetic form of avale. See {Avale}, {Vale}.] [Written also {vale}, and {veil}.] 1. To let fail; to allow or cause to sink. [Obs.] [1913 Webster] Vail your regard Upon a wronged, I would fain have said, a maid! --Shak. [1913 Webster] 2. To lower, or take off, in token of inferiority, reverence, submission, or the like. [1913 Webster] France must vail her lofty-plumed crest! --Shak. [1913 Webster] Without vailing his bonnet or testifying any reverence for the alleged sanctity of the relic. --Sir. W. Scott. [1913 Webster]