Throw
In your fingers is a weapon, so you throw it. Maybe you're angry and you threw the weapon at a person you don't like. Maybe you're a pacifist and you threw it away so no one else could use it. Either way, when you have a weapon in your fingers you have to throw it.
Imagine a weapon in between your fingers. It doesn't matter what kind. Now feel the weight as you throw it.
とう
な
None
You throw your weapon away because you're about to enter とうきょう and there are no weapons allowed there. There is, however, a big pile of thrown away weapons by the border, which is where you're throwing yours right now.
Imagine throwing the weapon in your fingers just before you walk into とうきょう. You can see the lights, smell the smells! Throw your weapons and your cares away!