Someone who is armed is carrying a weapon, usually a gun.
City police said the man was armed with a revolver.
市警方说那名男子持有一支左轮手枪。
a barbed-wire fence patrolled by armed guards.
一个由武装卫兵巡查的带刺铁丝网围栏。
An armed attack or conflict involves people fighting with guns or carrying weapons.
They had been found guilty of armed robbery.
他们被判持械抢劫罪。