戒厳

1. Origins, structure, and basic meaning

• Structure: In 戒厳 (かいげん), warning 戒 and strictness 厳 combine to denote martial law.
• Basic usage: 戒厳 denotes martial law, in which military authority controls public order or administration during an emergency.

2. Common pitfalls and similar expressions

• Martial law versus heightened alert
  • 戒厳下 means under that regime and is institutionally different from a mere heightened alert.