。
Dead leaves fell from the tree.
Literal
Tree [from-から] dead-leaves [subject-が] fell.
枯葉 ('dead leaves, withered leaves') is a compound of 枯れる ('to wither') + 葉 ('leaf'). Reading the kanji 葉 as -ば at the end of a compound is typical — the ha/ba rendaku voicing. 枯 also carries a melancholy, autumnal feeling in Japanese aesthetics.