halloo(n = noun.communication) - a shout to attract attention; "he gave a great halloo but no one heard him"
is a kind of call, cry, outcry, shout, vociferation, yell
Derived form verb halloo₂

1.  halloo(v = verb.contact) - urge on with shouts; "halloo the dogs in a hunt"
is one way to egg on, incite, prod
Sample sentences: Somebody ----s something

2.  halloo(v = verb.communication) - shout `halloo', as when greeting someone or attracting attention;
is one way to call, cry, holler, hollo, scream, shout, shout out, squall, yell
Derived form noun halloo₁
Sample sentences: Somebody ----s; Somebody ----s something to somebody

   A loud exclamation; a call to invite attention or to incite a person or an animal; a shout. [1913 Webster]
"List! List! I hear
Some far off halloo break the silent air." [1913 Webster]

   To cry out; to exclaim with a loud voice; to call to a person, as by the word halloo. [1913 Webster]
"Country folks hallooed and hooted after me." [1913 Webster]

1.  To encourage with shouts. [1913 Webster]
"Old John hallooes his hounds again." [1913 Webster]

2.  To chase with shouts or outcries. [1913 Webster]
"If I fly . . . Halloo me like a hare." [1913 Webster]

3.  To call or shout to; to hail. Shak. [1913 Webster]

   An exclamation to call attention or to encourage one. Now mostly replaced by hello. [1913 Webster]

halloo, 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.

Etymology:
perh. f. hallow pursue with shouts f. OF halloer (imit.)

VB  speak to, address, accost, make up to, apostrophize, appeal to, invoke, ball, salute, call to, halloo, take aside, take by the button, talk to in private, lecture, Int, soho!, halloo!, hey!, hist!.

VB  cry, roar, shout, bawl, brawl, halloo, halloa, hoop, whoop, yell, bellow, howl, scream, screech, screak, shriek, shrill, squeak, squeal, squall, whine, pule, pipe, yaup, cheer, hoot, grumble, moan, groan, snore, snort, grunt, vociferate, raise up the voice, lift up the voice, call out, sing out, cry out, exclaim, rend the air, thunder at the top of one's voice, shout at the top of one's voice, shout at the pitch of one's breath, thunder at the pitch of one's breath, s'_egosiller, strain the throat, strain the voice, strain the lungs, give a cry.