戸締り
とじまり · tojimari · JLPT N1 · noun
locking the doors
🚪🔒 戸締り = 戸 (door) + 締り (tightly shut): doors shut tight, all locked up
締まり means being tightly fastened or shut. 戸締り is the everyday phrase for checking that every door and window is locked before you leave home.