To Throw At
Transitive verb and Ichidan verb
なげつける
むすめから、頭に花びんを投げ付けられて、七はりをぬう大けがを負いました。
My daughter threw a vase at my head and gave me a serious injury that needed seven stitches.
せつ分の日にコウイチにまめを投げ付けてじゃ気をはらいました。
On the Setsubun, we threw dried beans at Koichi and chased the evil spirits away.
「サーモン、僕は君に夢中なんだ。」「フグ、私はあんたに怒り心頭よ。どうして私に向かってニンニクなんて投げ付けるのよ！」「ご…ごめん。鮭はニンニクの臭いが好きって聞いたことがあったんだ。」
"Salmon, I’m mad about you." "Fugu, I’m actually mad at you! Why did you throw garlic at me? "S..sorry I’ve heard that salmon like the smell of garlic."
You know that you're throwing something that is attaching to something else. How else can you say that? The best way would be to say to throw against or to throw at.
The readings just come from two vocab words you've hopefully seen already: 投げる and 付ける. So long as you know the readings for those words, the reading for this word should be no problem for you.