Lewis & Short

com-prĕcor (conp-), ātus, āri, v. dep. (lit. to worship a deity with all the usages belonging thereto; hence, in gen.), to pray to, supplicate, implore (mostly ante-class. and rare; not in Cic.); constr. alicui, aliquem, aliquid, or absol.: Jovi molā salsā, Plaut. Am. 2, 2, 108: deos, Ter. Ad. 4, 5, 65 and 70: caelestūm fidem, * Cat. 64, 191.
Absol., to pray, supplicate: abi intro et conprecare, Plaut. Mil. 2, 4, 41: Cythereïa, comprecor, ausis Assit, Ov. M. 10, 640; 12, 285; 14, 379.
With dat. of pers., to imprecate, wish for a person: tunc mortem comprecantur sibi, Sen. Ep. 99, 16: iratum principem alicui, Plin. Ep. 4, 25, 2; so absol., Plin. Pan. 2 fin.