The Collaborative International Dictionary of English v.0.48:

Sauce \Sauce\ (s[add]s), v. t. [Cf. F. saucer.] [imp. & p. p.
   Sauced (s[add]st); p. pr. & vb. n. Saucing
   (s[add]"s[i^]ng).]
   1. To accompany with something intended to give a higher
      relish; to supply with appetizing condiments; to season;
      to flavor.
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   2. To cause to relish anything, as if with a sauce; to tickle
      or gratify, as the palate; to please; to stimulate; hence,
      to cover, mingle, or dress, as if with sauce; to make an
      application to. [R.]
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            Earth, yield me roots;
            Who seeks for better of thee, sauce his palate
            With thy most operant poison!         --Shak.
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   3. To make poignant; to give zest, flavor or interest to; to
      set off; to vary and render attractive.
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            Then fell she to sauce her desires with
            threatenings.                         --Sir P.
                                                  Sidney.
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            Thou sayest his meat was sauced with thy
            upbraidings.                          --Shak.
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   4. To treat with bitter, pert, or tart language; to be
      impudent or saucy to. [Colloq. or Low]
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            I'll sauce her with bitter words.     --Shak.
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