To go head-to-head 意思是兩人之間頭對頭地競爭。
They're both amazing swimmers - I can't wait to see them go head-to-head.
There can only be one winner. We'll have to go head-to-head to decide who it is.
還有一個意思類似的短語是 neck-and-neck, 它的意思是在競爭或競賽中不相上下。
At this stage, either of them could win. It's neck-and-neck!
英語中還有很多類似結構的短語，比如 eye-to-eye, face-to-face, cheek-to-cheek, shoulder-to-shoulder 或 back-to-back 不過他們的意思各不相同!