int., n., & v.
int. 1 inciting dogs to the chase. 2 calling attention. 3 expressing surprise.
n. the cry 'halloo'.
v. (halloos, hallooed) 1 intr. cry 'halloo', esp. to dogs. 2 intr. shout to attract attention. 3 tr. urge on (dogs etc.) with shouts.
[ perh. f. hallow pursue with shouts f. OF halloer (imit.) ]