To cough or clear one's throat so as to draw attention.

Initialism of American Heritage Dictionary.

Initialism of alveolar hydatid disease.

At or towards the front; in the direction one is facing or moving. / So as to be further advanced, either spatially or in an abstract sense. / In or for the future. / To a later time.

(nautical) Used to hail a ship, a boat or a person, or to attract attention. / (humorous) Warning of something approaching or impending.

To hail with a cry of "ahoy".

An utterance of this interjection.

(India) The musical sounds in nature and in Indian music, especially percussion

(idiomatic) Changing before competitors. / (idiomatic) Above average; generally performing well.

(idiomatic) Having completed a task before it is due; ready, prepared, or anticipating.