The Collaborative International Dictionary of English v.0.48:

Compromise \Com"pro*mise\, v. t. [imp. & p. p. Compromised; p.
   pr. & vb. n. Compromising.] [From Compromise, n.; cf.
   Compromit.]
   1. To bind by mutual agreement; to agree. [Obs.]
      [1913 Webster]

            Laban and himself were compromised
            That all the eanlings which were streaked and pied
            Should fall as Jacob's hire.          --Shak.
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   2. To adjust and settle by mutual concessions; to compound.
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            The controversy may easily be compromised. --Fuller.
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   3. To pledge by some act or declaration; to endanger the
      life, reputation, etc., of, by some act which can not be
      recalled; to expose to suspicion.
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            To pardon all who had been compromised in the late
            disturbances.                         --Motley.
      [1913 Webster]

WordNet (r) 3.0 (2006):

compromising
    adj 1: making or willing to make concessions; "loneliness tore
           through him...whenever he thought of...even the
           compromising Louis du Tillet" [syn: compromising,
           conciliatory, flexible] [ant: inflexible, sturdy,
           uncompromising]
    2: vulnerable to danger especially of discredit or suspicion;
       "she found herself in a compromising situation"