興奮

1. Origins, structure, and basic meaning

• Structure: Spelling: 興奮. Reading: こうふん. Core meaning: excitement; agitation.
• Basic usage: Representative examples: 観客は逆転の瞬間に興奮して立ち上がった / 弟は旅の前夜、興奮してなかなか眠れなかった.

2. Common pitfalls and similar expressions

• Excitement and heightened arousal
  • It can describe joyful excitement at a comeback or heightened arousal that prevents sleep before a trip. Do not fix it as always negative “agitation” or always positive enthusiasm.