1. [transitive, intransitive] halloo (somebody) to attract somebody's attention by shouting

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2. [transitive] halloo something to shout at hunting dogs in order to tell them to start running after an animal

[TahlilGaran] English Dictionary ▲

1. used to attract somebody’s attention
2. used in hunting to tell the dogs to start running after an animal
Word Originmid 16th cent.: probably from the rare verb hallow ‘pursue or urge on with shouts’, from imitative Old French haloer.

[TahlilGaran] English Dictionary ▲