IPA: //ʌnˈʃiːð//
KK: /ʌnˈʃiːð/
To pull a sword or knife out of its cover or case.
He decided to unsheathe his sword before entering the dark cave.
Past: unsheathed
Past Participle: unsheathed
Unsheathe → It is formed from "un-" (meaning not) and "sheathe" (from Old English "sceathian", meaning to put a sword into a sheath). The word "unsheathe" means to take a sword out of its sheath, or to draw a weapon.
Think of 'not putting away' ('un-') a sword ('sheathe') — that's why unsheathe means to draw a sword out.