落とす (otosu) means “drop” | MotiTan Japanese Dictionary

More examples

急いでいて、鍵を落としました。iso i de i te kagi o o to shi ma shi ta

While I was hurrying, I dropped my keys.

Describes causing something to leave one's possession or control, either by letting it fall or by ending up without it.

取り落とすtoriotosu: To drop something accidentally while holding or carrying it.
なくすnakusu: To lose something and no longer know where it is.

物を手元や管理下から離し、下へ落下させたり、失ったりする。mono o te moto ya kan ri ka ka ra hana shi shita e rak ka sa se ta ri ushina tta ri su ru

The native verb 落とす (otosu) is the transitive counterpart of 落ちる (ochiru, "to fall"), expressing the act of making something fall.

In casual Japanese, the object of 落とす (otosu) is often omitted when the context makes clear what was dropped or lost.