Common Meanings
1
tóng同
Same, identical, alike; together with.
我们对这个项目的看法完全相同。
Our views on this project are exactly the same.
To be together, common, or same; often implies joint action or shared status.
我们共同完成了这个项目。
We jointly completed this project.
To be with; to associate or share with (someone); to be involved with.
她喜欢同朋友们一起分享快乐。
She likes to share happiness with her friends.
2
tòng同
Used exclusively in the word "胡同" (hútòng), which means "hutong" or "alley". In this context, "同" (tòng) does not have an independent meaning but forms part of the compound noun.
他喜欢在老胡同里散步。
He likes to take a walk in old hutongs.