に入れる

obtain; get

→ に
phrase Very common #514
obtain; get Most commonly used as part of 手に入れる, meaning to obtain or get something. The full expression is idiomatic and is not normally interpreted literally as “put into one’s hand.”
JA: 彼はその本を手に入れる。
EN: He will get that book.

シチューに入れる

Add it to the stew.

— ロード・オブ・ザ・リング/二つの塔 (2002)

子供を鞄に入れるな。

Don't put the child in the bag.

〈すぐ冷凍室に入れる〉

Put it in the freezer right away.

— 別れる決心 (2022)

その花びんに入れると花はもっときれいに見える。

The flowers will look even more beautiful in that vase.

砂糖は熱いコーヒーに入れると溶ける。

Sugar dissolves when added to hot coffee.

卵をすべて一つのかごに入れるな。

Don’t put all your eggs in one basket.