hollo

interj. & n.

[See Halloo, and cf. Holla.]
Ho there; stop; attend; hence, a loud cry or a call to attract attention; a halloo.

And every day, for food or play,
Came to the mariner's hollo.

Coleridge.

Hol·lo
v. i.

[imp. & p. p. Holloed ; p. pr. & vb. n. Holloing.]
[See Hollo, interj., and cf. Halloo.]
To call out or exclaim; to halloo.

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IN BRIEF: n. - A very loud utterance (like the sound of an animal) v. - Utter a sudden loud cry.