From en.wiktionary.org:
[Hollo]
** English
[en]
*** Alternative forms
- [en]
*** Etymology
See [en], and compare [en].
*** Interjection
[en-interj]
1. [en] Hey , hello
2. * {{ quote-book | en | year=1609 | author= | title=A Collection Of Old English Plays, Vol. IV. | chapter=Everie Woman In Her Humor | edition= | url=http://www.gutenberg.org/etext/10925
|passage=And then to _Apollo_ HOLLO, trees, hollo.}}
1. * {{ quote-book | en | year=1922 | author=Jacob Grimm; Wilhelm Grimm | title=Grimm's Fairy Stories | chapter= | edition= | url=http://www.gutenberg.org/etext/11027
|passage=Presently up came the clerk; and when he saw his master, the parson,
running after the three girls, he was greatly surprised, and said, "Hollo!
HOLLO! your reverence! whither so fast!}}
1. [en] hello (expressing puzzlement or discovery)
2. * {{ quote-text | en | year=1897 | author=Richard Marsh | title=The Beetle
|passage=‘ HOLLO!’ he cried. ‘The blind’s down!’ I had noticed, when we were
outside, that the blind was down at the front room window.}}
*** Noun
[en-noun]
1. A cry of " hollo "
2. * {{ quote-book | en | year=1798 | author=Samuel Taylor Coleridge | title=Coleridge's Ancient Mariner and Select Poems | chapter=Rime of the Ancient Mariner | edition= | url=http://www.gutenberg.org/etext/11101
|passage=And a good south wind sprung up behind; The Albatross did follow, And
every day, for food or play, Came to the mariners' HOLLO!}}
1. * {{ quote-book | en | year=1819 | author=Walter Scott | title=Ivanhoe | chapter= | edition= | url=http://www.gutenberg.org/etext/82
|passage="I always add my HOLLO," said the yeoman, "when I see a good shot, or
a gallant blow."}}
1. * {{ quote-book | en | year=1910 | author=W.F. Drannan | title=Chief of Scouts | chapter= | edition= | url=http://www.gutenberg.org/etext/12895
|passage=The old chief stepped to the entrance of the wigwam and made a
peculiar noise between a whistle and a HOLLO, and in a few minutes there were
hundreds of Indians there, both bucks and squaws.}}
*** Verb
[~es]
1. To cry " hollo "
2. * {{ quote-book | en | year=1899 | author=J. S. LeFanu | title=Uncle Silas | chapter= | edition= | url=http://www.gutenberg.org/etext/14851
|passage=And Tom made another loutish salute, and cut the conference short by
turning off the path and beginning to HOLLO after some trespassing cattle.}}
1. * {{ quote-book | en | year=1904 | author=Edward Dowden | title=Robert Browning | chapter= | edition= | url=http://www.gutenberg.org/etext/12817
|passage=Better HOLLO abstract ideas through the six-foot Alpine horn of
prose.}}