to use illegally or without permission / to pirate, to plagiarize

unauthorized use, piracy (of software, etc.), plagiarism

adjective

head voice

(military) a private second class (enlisted rank below first-class private the Imperial Japanese Army)

running away

to run away; to abscond; to escape; to flee

frostbite

nastiness / nauseating, sickening / (onomatopoeia) sound of the bird's chirp

The first day of winter (one of the solar terms)