The Collaborative International Dictionary of English v.0.48:

Compromit \Com"pro*mit`\, v. t. [imp. & p. p. Compromitted; p.
   pr. & vb. n. Compromitting.] [L. compromittere. See
   Compromise, n.]
   1. To pledge by some act or declaration; to promise. --State
      Trials (1529).
      [1913 Webster]

   2. To put to hazard, by some indiscretion; to endanger; to
      compromise; as, to compromit the honor or the safety of a
      nation.
      [1913 Webster]