必

Glyph origin
Likely a – weapon handle made of bamboo strips; the original character for. The character was phonetically borrowed for the senses of "certainly" and "must".

Unrelated to, as bronze script makes clear, but in current form very similar.

Etymology
.

Definitions

 * 1) surely; most certainly; always; invariably
 * 2) must; have to; shall
 * 3)  to crack
 * 4)  to chap
 * 5)  crowded; packed; congested
 * 1)  to crack
 * 2)  to chap
 * 3)  crowded; packed; congested
 * 1)  to crack
 * 2)  to chap
 * 3)  crowded; packed; congested

Etymology
From.