Wiktionary
head up
vb. 1 (context idiomatic English) To lead or take the lead; to direct; to take charge. 2 To close (a cask, barrel, etc.) by fitting a head to it.
WordNet
head up
v. be the first or leading member of (a group) and excel; "This student heads the class" [syn: head]
Wikipedia
Head up
Usage examples of "head up".
One kid who did not need to be told to get his head up following Bangor West's 9-2 loss was Ryan Larrobino.
After Timmy pushed the button for the third floor, he turned and smiled at me, bobbing his head up and down.
Tom wagged his head up and down, and there was a glint in his eyes when he heard of the Riders.