The Collaborative International Dictionary of English v.0.48:

Let \Let\, v. i.
   1. To forbear. [Obs.] --Bacon.
      [1913 Webster]

   2. To be let or leased; as, the farm lets for $500 a year.
      See note under Let, v. t.
      [1913 Webster]

   To let on, to tell; to tattle; to divulge something. [Low]


   To let up, to become less severe; to diminish; to cease;
      as, when the storm lets up. [Colloq.]
      [1913 Webster]