noun
Refers to the tip of a tube, hose, or firearm barrel. Can be used literally for a nozzle or muzzle, and figuratively for being at gunpoint.
ホースの筒先を花壇に向けて水をやった。
I pointed the nozzle of the hose at the flower bed and watered it.
犯人は店員に筒先を突きつけた。
The criminal pointed the gun at the store clerk.