n. & v.
n. 1 a a number of animals of one kind, esp. birds, feeding or travelling together. b a number of domestic animals, esp. sheep, goats, or geese, kept together. 2 a large crowd of people. 3 a a Christian congregation or body of believers, esp. in relation to one minister. b a family of children, a number of pupils, etc.
v.intr. 1 congregate; mass. 2 (usu. foll. by to, in, out, together) go together in a crowd; troop (thousands flocked to Wembley).
[ OE flocc ]