Halloo

1.

A loud exclamation; a call to invite attention or to incite a person or an animal; a shout.

2.

An exclamation to call attention or to encourage one.

1.

(INTRANSITIVE) To cry out; to exclaim with a loud voice; to call to a person, as by the word halloo.

2.

(TRANSITIVE) To encourage with shouts.

3.

(TRANSITIVE) To chase with shouts or outcries.

4.

(TRANSITIVE) To call or shout to; to hail.