hollo

interjection, noun pl. hollos

1. (a shout or call) used as to attract a person's attention or to urge on hounds in hunting
2. (a shout) used to express greeting or surprise

intransitive verb, transitive verb holloed, holloing

1. to shout (at) in order to attract attention
2. to urge on (hounds) by calling out “hollo”
3. to shout or call, as in greeting