Herd  —n. 1 a number of animals, esp. Cattle, feeding or travelling or kept together. 2 (prec. By the) derog. Large number of people; mob (tends to follow the herd). —v. 1 (cause to) go in a herd (herded together for warmth; herded the cattle into the field). 2 look after (sheep, cattle, etc.). [old english]