The act of throwing or tossing something in (physically putting something in by throwing).
ゴミ袋に紙を投げ込みました。
I tossed the paper into the trash bag.
試合の最後に彼がボールを投げ込み、得点が決まった。
At the end of the game he threw the ball in, deciding the score.
箱に資料を投げ込みで集めた。
He gathered the materials by throwing them into the box.
An insert (leaflet or flyer) placed into a newspaper, magazine, or mailed packet — e.g., an advertising insert.
今朝の新聞に投げ込みのチラシが入っていた。
There was an insert flyer in this morning's newspaper.
スーパーは投げ込みで新商品を宣伝した。
The supermarket promoted its new product via inserts.
A free-style floral arrangement technique (nagekomi), where flowers and branches are arranged loosely as if tossed in.
彼女は投げ込みの手法で自然な雰囲気の花を活けた。
She arranged flowers in a natural style using the nagekomi technique.
投げ込みは初心者でも始めやすい生け花の一つだ。
Nagekomi is one of the ikebana styles that beginners can start with easily.