HOLLO
bellow, bellowing, holla, holler, hollering, hollo, holloa, roar, roaring, yowl
(noun) a very loud utterance (like the sound of an animal); “his bellow filled the hallway”
shout, shout out, cry, call, yell, scream, holler, hollo, squall
(verb) utter a sudden loud cry; “she cried with pain when the doctor inserted the needle”; “I yelled to her from the window but she couldn’t hear me”
hollo
(verb) cry hollo
hollo
(verb) encourage somebody by crying hollo
Source: WordNet® 3.1
Etymology
Interjection
hollo
Hey, hello
Noun
hollo (plural hollos)
A cry of "hollo"
Verb
hollo (third-person singular simple present holloes, present participle holloing, simple past and past participle holloed)
To cry "hollo"
Source: Wiktionary
Hol*lo", interj. & n. Etym: [See Halloo, and cf. Holla.]
Definition: 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.] Etym:
[See Hollo, intery., and cf. Halloo.]
Definition: To call out or exclaim; to halloo.
Source: Webster’s Unabridged Dictionary 1913 Edition