grĕgo — Lewis & Short
grĕgo, āvi, ātum, 1, v. a.id.,
I to collect into a flock or herd, to gather into a host, to collect, assemble (poet. and only postAug.):
Levitas ad se gregavit,Sulp. Sev. Chron. 1, 19, 6:
Idaliae volucres caeloque domoque gregatae,Stat. Achill. 1, 373:
oves,Paul. Nol. Carm. 17, 200: solus qui caedibus hausi Quinquaginta animas: totidem totidemque gregati Ferte manus, all together, Stat. Th. 8, 668 (al. gregatim).