[LargeTomato]

"Root for" someone means to cheer for someone or look forward to someone's success. You root for sports teams, your kid to do well on their test, or for your candidate to win an election.

Barrack in British English can mean to jeer or boo someone. That's the opposite of root. I've never heard the word barrack used like this in America.

[gumby]

In australia we use barrack the opposite way you do, apparently. I assumed the GP was an aussie, but it seems some people didn't like my comment.