Lewis & Short

ob-lŏquor, locūtus, 3, v. dep.

  1. I. In gen., to speak against a person or thing; to interrupt a speaker; to gainsay, contradict (class.; syn. interpello); constr. with dat. or absol.
          1. (α) With dat.: alicui, Plaut. Men. 1, 2, 46: vestra exspectatio, quae mihi obloqui videtur, Cic. Clu. 23, 63.
          2. (β) Absol.: obloquere, Plaut. Curc. 1, 1, 41: te blaterare atque obloqui? Afran. ap. Non. 78, 33: ut me et appelles, et interpelles, et obloquare, et colloquare, velim, Cic. Q. Fr. 2, 10, 1: ferocissime, Curt. 10, 2, 30.
  2. II. In partic.
    1. A. To sing to, to accompany or join in singing (poet.): non avis obloquitur, Ov. P. 3, 1, 21: obloquitur numeris septem discrimina vocum, mingles the notes of his lute, accompanies on his lute, Verg. A. 6, 646.
    2. B. To blame, condemn (post-Aug.), Sen. Ep. 121, 4; Vulg. Psa. 43, 17.
    3. C. To rail at, reproach, abuse (poet.): quod nunc gannit, et obloquitur, Cat. 83, 3.