Collûsor, pen. prod. aliud Veib. Plin. iun.A play fellow: Also be that doth any thing by couin or collusion.Compransores & collusores alicuius.Cic.Consessor & collusor.Cic.Collusoriè Aduerb. qualitatis. Vlp. With couin or frand.Agere causam collusoriè. Vlp. Litigare collusoriè. Vlp.
Lewis and Short: Latin dictionary
collūsor (conl-), ōris, m. [colludo]. I.A companion in play, playmate (in good prose), Cic. Phil. 2, 23, 56; 2, 39, 101; 5, 5, 13; Suet. Calig. 41; Plin. Ep. 9, 33, 8; Dig. 11, 5, 1, 1.— II. (Acc. to colludo, II.) He who has a secret understanding with one to the injury of a third, in law, Cod. Th. 7, 20, 2.