The act of backing ones-self in a competitive situation, with the
confidence that you will succeed - i.
e. there is no such
thing as a 50/50 ball. It's always yours.
I really admire
Jonny Wilkinson's backage in the contact, he really backs himself to tackle anyone that comes near him.
or alternatively;
Newcastle backed themselves to bounce back and score after the
break, having fallen behind in the
first half.