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If two people, teams, or companies go head-to-head, they compete directly with each other — not as two names in a big crowd, but facing one another. Sports and business news like this phrase: a final between two players, two brands selling the same thing. You can say they went head-to-head, or a head-to-head contest. It paints two heads pointed at each other, close up. Neutral, common in commentary. Though actually, it is about a direct match, not about using your head to think, and not about heads touching.
正面對決、直接較量
組成From head + to + head: two people with their heads toward each other, as if in a close contest.
原始詞典資料3 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
head-to-headadj/ˌhɛd tu ˈhɛd/
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Direct, one-to-one.
- 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.
head-to-headadv/ˌhɛd tu ˈhɛd/
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Facing one another.
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Directly, one-to-one.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。