lying on the ground, after falling down

A fallen tree was blocking the road. 一棵倒下的大树挡住了路。

having dropped down

fallen leaves 落叶

used to refer to someone who has been defeated or has lost a position of power

The Education Minister will now join the ranks of other fallen politicians. 现在教育部长和其他政坛人物一样失势了。

soldiers who have died in a war

a statue in memory of the fallen 纪念阵亡将士的雕像