This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 弡 is uncertain. It combines 弓 (bow) and 巨 (large), but the original meaning and component relationship are unclear.
With no clear meaning, picture a large bow (弓 + 巨) that is so strong it is hard to define—its purpose is uncertain.
For クツ, imagine a strong warrior wearing boots (クツ) while pulling a giant bow: boots -> クツ, and the bow is huge.