If something is top-heavy, it has more weight in the higher part than in the lower part and will not balance correctly.

The main reason the ship capsized was that it was top-heavy. 该船倾覆的主要原因是上重下轻。

figurative If they sacked a few senior managers, the company would be less top-heavy. 如果他们解雇一些高级经理的话，公司就不会显得这么头重脚轻了。