Head-to-head

The brave soldiers went head-to-head with the enemy to regain their city.

Goldberg cautioned that the Chinese study was observational, relying on information provided by the mothers many years after they had given birth, so the findings do not prove a cause-and-effect relationship. She said what's needed is a head-to-head comparison of women who breast-feed with a control group of those who don't, to see whether there are long-term heart-healthy benefits.

For years, Southwest sought to avoid head-to-head competition with big, traditional airlines.

Fat Bear Week, which started in 2014, is an annual competition where brown bears from Alaska's Katmai National Park face off in head-to-head matchups -- similar to a March Madness bracket -- with people around the world voting for who they believe is the fattest of the bunch, the National Park Service said in a press release.