復 (Kanji for return or re-do)

Onyomi

FUKU

That dork forgot his butt, so I made him go home, return, and get it. Only a FOOL COUld forget his own butt.

復習(ふくしゅう) する	review ★★★☆☆ 復 (return or re-do) + 習 (learn) = 復習 (review ) review what you've learned - like vocabulary or even kanji.
から回復(かいふく) する	to recover ★★★☆☆ 回 (rotate / times) + 復 (return or re-do) = 回復 (to recover)
復讐(ふくしゅう)	revenge! ★★☆☆☆ KIDS
往復(おうふく)	round trip ★☆☆☆☆ 往 (depart) + 復 (return or re-do) = 往復 (round trip)

The PERSON has a wound,

in the ORGAN of her entrails.

The DUCKY wrote a physics paper which was too complicated,

so we have to GO back and redo it.