合宿

1. Origins, structure, and basic meaning

• Structure: 合宿 (がっしゅく) combines together 合 and lodging 宿 to denote a residential training camp.
• Basic usage: Participants stay at a facility and practice intensively before a competition or during summer.

2. Common pitfalls and similar expressions

• Purposeful residential training
  • 合宿 includes shared lodging, but its central point is sustained group practice or study rather than leisure travel.