Definition of "cobber"

“He′s a good cobber, even if he is the parson,” he said at last. “He′s a good cobber.”“That′s right,” said Jim patiently. “He′s a good cobber, and he′s the parson. Now you buzz off and leave him be. We′ve got business to talk here.”

1953, Nevil Shute, In the Wet, published 2010, unnumbered page

He was the first member of our forces we had seen for five months. “Hi ya, cobber,” muttered Don.

1955, Charles McCormac, “You′ll Die in Singapore!”‎, page 181

A voice from out of nowhere challenged: “Who is going away cobber?” “Bob!” I shouted. “Boy, am I glad to see you ... Where the hell have you been, my dear bloody cobber?”

2009, George W. Adams, Under the Southern Cross‎, page 137