Best defense is offence.

　　进攻是最好的防御/先下手为强。

　　【世博精解】

　　Defense, the American spelling of defence, it means the act of protecting something or someone from attack.防御；防卫；防护。Air defense防空/ frontier defense边防/ defense and offence strategies and tactics防守和进攻的战略战术。

　　Offence, the act of attacking,进攻，攻击。Weapons of offense进攻性武器。

　　这个谚语从字面上解释是“最好的防御就是进攻”，意为“进攻是最好的防御”或“先下手为强”。