警備隊

1. Origins, structure, and basic meaning

• Structure: 警備隊, read けいびたい, is a compound noun for a guard unit or security force.
• Basic usage: 警備隊が巡回する makes the unit the patrol agent; 警備隊の交代時刻 identifies its shift time.

2. Common pitfalls and similar expressions

• An organized guard unit
  • 警備隊 is an organized force assigned to guarding or protection. It denotes a unit operated through personnel and shifts, not a single individual guard.