hallooing
həˈluː
haˈluː
verb
cry or shout ‘halloo’ to attract attention or to give encouragement to dogs in hunting.
I hallooed in the hope that they might hear my shouts
call out,shout,cry out,yell,bawl,bellow,scream,shriek,screech,roar,whoop,call hello to,hail,greet,holler,yoo-hoo,cooee