南京錠

1. Origins, structure, and basic meaning

• Structure: 南京錠, read なんきんじょう, joins the conventional label 南京 with lock 錠 as the name of a padlock.
• Basic usage: It denotes a portable lock fastened through a hasp, as in 扉に南京錠を掛ける.

2. Common pitfalls and similar expressions

• Scope and context
  • It is a detachable kind of lock, not the entire built-in locking mechanism of a door.