手 hand

He used his hand to Show His Underpants.

skilllfully done! ★★★★☆ FP
上 (above) + 手 (hand) = 上手 (skilllfully done!)

skillfully done! Usually used to praise one's friends' efforts (at art, music, cooking, etc.)

to do without asking ★★★★☆ KUNKUN
勝 (win) + 手 (hand) = 勝手 (to do without asking)

to do like a dick. I mean, to do something selfishly without asking, like you're the only one on the planet. I ate MY cake, but then I かってに ate your cake too, and just look at you like, "What?" (****)

untalented / poor ★★★★☆ FP
下 (below) + 手 (hand) = 下手 (untalented / poor)

XXX is untalented, poorly performed, or poorly made.

this is not my thing! ★★★☆☆ KUNKUN
苦 (suffer) + 手 (hand) = 苦手 (this is not my thing!)

this has 2 meanings. One is "I'm not good at this" and the second is "I don't like this" Clever Japanese!

partner ★★★☆☆ KUNKUN
相 (partner) + 手 (hand) = 相手 (partner)

one's partner (in conversation, tennis, or anything else however temporary)

one-handed ★★☆☆☆ KUNKUN
片 (fragment) + 手 (hand) = 片手 (one-handed)

to do xxx one-handed.

handmade ★★☆☆☆ NEO
手 (hand) + 作 (make) = 手作り (handmade)