出陣

1. Origins, structure, and basic meaning

• Structure: 出陣 (しゅつじん) is an action noun, used with する, for setting out into battle or a hard-fought campaign.
• Basic usage: 選挙戦へ出陣した figuratively sends a candidate into an election campaign, while 夜明けに出陣した literally sends a warrior into battle in a historical drama.

2. Common pitfalls and similar expressions

• Election campaign and literal battle
  • 出陣 extends from the military action in the second example to political competition in the first. The candidate in 選挙戦 is not thereby a warrior, nor is the historical warrior an election candidate.