出征

1. Origins, structure, and basic meaning

• Structure: 出征 is read as しゅっせい and is a noun and する verb for a soldier's departure to take part in war or military deployment.
• Basic usage: A family seeing someone off appears in 出征する青年, while anxiety before departure appears in 出征前の不安.

2. Common pitfalls and similar expressions

• A purpose limited to war
  • It does not mean departure for an ordinary trip or business journey; it is specifically tied to leaving for war.
• Difference from 出発
  • 出発 broadly means departure regardless of purpose, whereas 出征 carries a military, historical, and wartime context.