- head-to-head＝「面と向かって、直接対決の」という意味（competing directly with another person or group／in open, direct conflict or competition ）で形容詞、副詞として使われることが多いが、ここでは名詞として使って「協議」（a conversation, confrontation, or contest between two parties ※confrontation：対決、対面／a situation, meeting, programme, etc. in which two people discuss something directly with each other, especially in order to see which person seems the best）という意味になっている。
- Courier companies are going head-to-head with the Post Office. ※courier：宅配便業者
- The governor and the senator went head to head in a spontaneous debate. ※senator：上院議員
- They are set to meet head-to-head in next week's final.
- The product will go head-to-head (= compete directly) with the current brand leader.
- The two brothers went at it head-to-head.
- It was a head-to-head contest all the way.
- The two stores are in head-to-head competition.
- The two teams go head-to-head on Sunday.
- The two teams will compete head-to-head for the championship.
- He'll go head-to-head with his toughest opponent in the upcoming debate. ※opponent：（競技議論ゲームなどの）対抗者、相手、敵
- Two of the best known names in the industry took part in a televised head to head last night.
- I reviewed my advantages: I was lighter, and faster; in fact, in any head-to-head contest he could never defeat me, but...(Adair, Tom (Intro), THREE KINDS OF KISSING - SCOTTISH SHORT STORIES (1993))
- Google and Apple to go head to head over 'smart' TVs （※タイムリーなニュース見出し）