Sentence:  He played with Jacko like a child—rolled with him about the decks—<WSD>hallooed</WSD> him on to all manner of mischief—clapped his hands and cheered him in his performance, and then, in his own language, pronounced a high eulogy upon his achievements. 
Meaning of the word marked with <WSD> tags:  To encourage with shouts; to egg (someone) "on".