“to fall” in Japanese is 落, read raku, o, oto (らく, お, おと). It is a Grade 3 Kyōiku kanji, taught in year 3 of Japanese elementary school, and appears in words such as 落下 (falling).
What does 落 mean?
木から葉が落ちる。
Same sound, different character — the classic trap. Compare them side by side: