to hang up (e.g. a coat, a picture on the wall); to let hang; to put on (e.g. a blanket); to put on top of; to put on (glasses, etc.); to wear (a necklace, etc.); to make (a call)
Examples (3 in total)
彼女はドアに鍵を掛けた。
She locked the door.
必ずドアに鍵を掛けるようにして下さい。
Please make sure that the door is locked.
私は非常に急いでいたので、ドアの鍵を掛けるのを忘れてしまった。
I was in such a hurry that I forgot to lock the door.