攻防

1. Origins, structure, and basic meaning

• Structure: 攻防 (こうぼう) is the exchange of offense and defense or a struggle over control.
• Basic usage: 試合の激しい攻防 describes play between attack and defense; 橋を巡る攻防 describes a struggle over a bridge.

2. Common pitfalls and similar expressions

• Offense-defense exchange and contested objective
  • The noun includes both sides of the contest, and を巡る identifies the objective being fought over.