hail

(transitive) To greet; give salutation to; salute.

(transitive) To name; to designate; to call.

(transitive) To call out loudly in order to gain the attention of.

(transitive, by extension, UK, Australia) To indicate, from a designated stop or otherwise, to the driver of a public transport vehicle that one wishes to board and travel on the vehicle, usually using hand signals such as waving.

(transitive) To signal in order to initiate communication with.