Halloo

n.	1.	A loud exclamation; a call to invite attention or to incite a person or an animal; a shout. List! List! I hear Some far off halloo break the silent air. - Milton.
v. i.	1.	To cry out; to exclaim with a loud voice; to call to a person, as by the word halloo. [imp. & p. p. Hallooed (-lŌd"); p. pr. & vb. n. Hallooing.] Country folks hallooed and hooted after me. - Sir P. Sidney.
v. t.	1.	To encourage with shouts. Old John hallooes his hounds again. - Prior.
	2.	To chase with shouts or outcries. If I fly . . . Halloo me like a hare. - Shak.
	3.	To call or shout to; to hail.
interj.	1.	An exclamation to call attention or to encourage one. Now mostly replaced by hello.

Noun	1.	halloo - a shout to attract attention; "he gave a great halloo but no one heard him"
Verb	1.	halloo - urge on with shouts; "halloo the dogs in a hunt"
	2.	halloo - shout `halloo', as when greeting someone or attracting attention

egg on, incite, prod