Lewis & Short

col-lūdo (conl-), si, sum, 3, v. n., to play or sport together, play with (very rare).

  1. I. Prop., with dat.: (puer) gestit paribus colludere, * Hor. A. P. 159.
    Poet.: aut summā nantes in aquā colludere plumas, * Verg. G. 1, 369: DIGITIS COLLVDENTIBVS TRADERE PECORA, Inscr. Orell. 3166.
  2. II. Jurid. t. t., to keep up false appearances with one to the injury of a third person, to have a secret understanding with one, to act collusively, * Cic. Verr. 2, 2, 24, § 58; Dig. 3, 4, 7, § 9; 41, 5, 7; Sen. Contr. 2, 11, 17: cf. collusio and colludium, 2.