halloo

/HH AE1 L UW0/
noun
  1. 1

    A shout of halloo.

verb
  1. 1

    To shout halloo.

  2. 2

    To encourage with shouts; to egg (someone) on.

  3. 3

    To chase with shouts or outcries.

  4. 4

    To call or shout to; to hail.

  5. 5

    To shout (something).

interjection
  1. 1

    Used to greet someone, or to catch their attention.

  2. 2

    Used in hunting to urge on the pursuers.

Source: https://en.wiktionary.org/wiki/halloo