同どう窓そう生せい

noun

fellow alumnus; graduate of the same school; former schoolmate

Refers to someone who attended the same school, typically at the same time or as part of the same graduating class. Often used in reunion contexts.

• 彼かれは私わたしの大だい学がくの同どう窓そう生せいです。

  He is a fellow alumnus from my university.

• 同どう窓そう生せいとの再さい会かいを楽たのしみにしています。

  I'm looking forward to reuniting with my former schoolmates.