Lewis Short
mussĭto, 1
* V. freq. n. and a. [musso].
* Neutr., to be silent, keep quiet, not let one's self be heard; to speak in an undertone, to mutter, grumble (not in Cic. or Caes.): si sapis, mussitabis,Plaut. Mil. 2, 5, 65: sub lectis latentes metu mussitant,id. Cas. 3, 5, 33: ita clam quidam mussitantes,Liv. 1, 50: cum David vidisset servos suos mussitantes,Vulg. 2 Reg. 12, 19: contra nos,id. Exod. 16, 7.
* Act., to say in a low tone, to mutter, murmur any thing: to be silent respecting, to take no notice of a thing: ego (haec) mecum mussito,Plaut. Mil. 3, 1, 119; id. Truc. 2, 2, 57; 2, 6, 10.— With rel.-clause: malo ambigere bonos, quam ob rem id non meruerim, quam, quod est gravius, cur impetraverim, mussitare,Amm. 14, 6, 8: accipienda et mussitanda injuria adulescentium est,is to be borne in silence,Ter. Ad. 2, 1, 53: timorem,App. Mag. p. 320.
Charlton T. Lewis, Charles Short, A Latin Dictionary