noun
Refers to a storage locker, such as those found in schools, gyms, or stations. The Japanese usage is essentially the same as the English loanword.
駅のロッカーに荷物を預けた。
I left my luggage in a locker at the station.
体育館のロッカーに着替えを入れておく。
I keep a change of clothes in the gym locker.