Used to greet someone, or to catch their attention(interjection)
A shout of halloo (noun)
To shout halloo (verb)
Examples of word halloo
Then I hallooed, first making sure that there was no one lurking near to overhear, and waved my handkerchief, keeping my horse standing to his fetlocks in the current, until over the water came an answering halloo from the Golden Horn, and I could plainly see Captain Calvin Tabor on the quarter-deck.
Sophie acknowledged the fact with a grimace as, with a wave and a whooping "halloo," Clarissa shot past.
One might "halloo" to an old acquaintance forty rods distant, down a country lane; but on Broadway he bows only to the ones whom he meets point blank.
At the same moment there was a "halloo" outside, and a woman burst open the door, turning quickly to shut out behind her the onrush of the shower and the biting cold of the wind.
The real pioneer never emigrates gregariously; he does not wish to be within "halloo" of his nearest neighbor; he is no city-builder; and, if he does project a town, he christens it by some such name as Boonville or Clarksville, in memory of a noted pioneer: or Jacksonville or
"Now jump!" cried Niels; and with one joyous "halloo" the children were on the broad, springy plank, enjoying to the utmost this novel pleasure.
A faint "halloo" would answer when she heard him, and then he would find her under a tree or bush, with her unfortunate head between her hands, a picture of misery.
He raised his voice in a long "halloo" and rapped three times on the table.
It was distant, - a singsong note, resembling the woodland "halloo" we often hear.