(verb) : ingrŭo, ŭi, 3, in-ruo, with an epenth. g from gruo, kindr. with κρούω
* To rush or break into, to fall violently upon, assail, attack (syn. incumbo; differing from immineo and impendo, in that it denotes the actual doing of that which they merely threaten; not in Cic. or Caes.).
* Lit.: hostes crebri cadunt; nostri contra ingruunt,Plaut. Am. 1, 1, 81: ingruit Aeneas Italis,Verg. A. 12, 628; cf.: ingruere hostes,id. ib. 11, 899: simul ingruunt saxa jaciunt,Tac. A. 1, 27: ingruentes accusatores,id. ib. 6, 38: ingruente in Italiam Hannibale,id. H. 3, 34.
* Transf., of things: ferreus ingruit imber,Verg. A. 12, 284: umbra vitibus,id. G. 2, 410: nox,Tac. A. 4, 50: tela,id. ib. 1, 65: ingruere morbi in remiges coeperunt,Liv. 37, 23, 2: si bellum ingrueret,Verg. A. 8, 535; Tac. A. 1, 48: si nullus ingruat metus,Plin. 9, 30, 50, § 95: si quid subitum ingruat,Tac. A. 4, 2: damnatio,id. ib. 4, 35.

s. TLL