halloo

[huh-loo] /həˈlu/
interjection, noun, plural halloos, verb (used without object), verb (used with object), hallooed, hallooing.
1.
British Dictionary definitions for halloo

halloo

/həˈluː/
sentence substitute
1.
a shout to attract attention, esp to call hounds at a hunt
noun (pl) -loos, -los, -loas
2.
a shout of "halloo"
verb -loos, -looing, -looed, -los, -loing, -loed, -loas, -loaing, -loaed
3.
to shout (something) to (someone)
4.
(transitive) to urge on or incite (dogs) with shouts
Word Origin
C16: perhaps variant of hallow to encourage hounds by shouting