施錠

1. Origins, structure, and basic meaning

• Structure: 施錠, read せじょう, denotes securing a door or window with a lock so that it cannot be opened.
• Basic usage: It covers locking an entrance when leaving and checking each window lock before sleeping.

2. Common pitfalls and similar expressions

• Locking rather than merely closing
  • It goes beyond closing a door or window and secures it against opening with a lock.