unfasten
🇺🇸
/ʌnˈfæsn/
🇬🇧
/ʌnˈfɑːsn/
to open or release something that is tied, attached, or closed
Before painting, make sure to unfasten the windows so they don't get stuck shut.
도색하기 전에 창문을 풀어서 붙지 않도록 하십시오.