Defense; actions or methods to protect against attacks, including physical or tactical protection (noun/suru).
彼は相手の攻撃をうまく防御した。
He skillfully defended against the opponent's attack.
防御力の高い装備を整えた。
They equipped themselves with high-defense gear.
チームは守備を固めて防御に回った。
The team tightened its defense and focused on defending.