悬案 (xuán'àn): unsolved case

Measure Word

一桩悬案 zhuāng

这起悬案困扰了警方多年。

Zhè qǐ xuán'àn kùnrǎo le jǐngfāng duōnián.

This cold case troubled the police for years.

至今仍然是一桩悬案。

Zhìjīn réngrán shì yī zhuāng xuán'àn.

It remains an unsolved case to this day.

memory

悬 (hanging/suspended) + 案 (case) — a case left hanging, unresolved.

悬 xuán

案 àn