先さきに通とおす

expression, godan verb (-su)

let someone go first; let someone pass ahead

Used when allowing another person to go through a door, walk ahead, or proceed before oneself. Often a polite gesture.

• お先さきにどうぞ。先さきに通とおします。

  Please go ahead. I'll let you pass first.

• 彼かれは私わたしを先さきに通とおしてくれた。

  He let me go first.