I was watching an episode of ファニエスト外語学院 on judo.
At 6:26, the judoka remarked how his opponent ボビー could win him just by his horrid face, saying 「顔で一本取られた」って感じです
.
I am interested in understanding why the 助数詞 本
was used in the expression, especially when it is used for small, long things. I looked up 一本取る
in ディジタル大辞泉 , which gives the definition 柔道・剣道などで、完全に技が一つ決まること。
So I believe 一本
here houses the meaning 'in one go/shot/try', though I am not completely sure.