Lewis & Short

mūgĭnor, āri, v. dep., to dally, trifle, hesitate, delay (rare but class.): muginari est nugari et quasi tarde conari, Paul. ex Fest. p. 147 Müll.: muginamur, Lucil. ap. Non. 139, 6; Att. ib. 139, 7: dum tu muginaris, cepi consilium domesticum, Cic. Att. 16, 12, 1.
In the collat. form, mūsĭnor, āri: dum ista (ut ait M. Varro) musinamur. Plin. H. N. prooem. § 18.

mūsĭnor, āri, v. muginor fin.