What Makes a Pay Increase "Inflation Busting?"

That's what readers of a Reuters article on complaints from a German business group must be asking themselves. At one point the article told readers:

"Major unions negotiated inflation-busting hikes in pay checks last year after years of wage restraint, although the Statistics Office said last month real wages across Germany were likely to have fallen in 2013."

It's not clear what the definition of "inflation-busting" is in this context, but it doesn't sound like it involved large pay increas...