Defense; the act of protecting or the defensive side's play or tactics, especially in sports.
昨日の試合はディフェンスが崩れて大量失点した。
In yesterday's game, the defense collapsed and conceded many goals.
あのチームはディフェンスが堅いので点が取りにくい。
That team has a strong defense, so it's hard to score against them.
コーチはディフェンスの戦術を変更した。
The coach changed the defensive tactics.