Definitions

1. verb

to call out in a loud, cheerful, or friendly manner, especially to attract attention or to greet someone

“She hallooed from the window to catch the attention of her friend walking down the street.”

2. interjection

an expression of greeting or salutation, especially in a rustic or informal manner

“Haloo! Welcome to our little village!”

3. noun

a shout or call, especially one that is loud and cheerful

“The halloo of the crowd echoed through the stadium as the team scored a goal.”

4. verb

to shout or call out loudly, often in a rural or rustic setting

“The cowherd halloos to his cows to bring them back to the farm.”