help
弼 centers on providing assistance or support, especially in a corrective or reinforcing way. The core idea is helping someone or something stay on track.
弼 combines 弜 (a doubled bow shape, suggesting strength or tension) with 百 (hundred), possibly indicating strong support or correction. The exact historical development is uncertain.
Picture two bows (弓弓) flanking a hundred (百) arrows. The bows reinforce each other, helping the archer stay steady and correct their aim.
For ヒツ, imagine a helper handing you a pair of hits (punches) on a punching bag to correct your form: hits -> ヒツ, and the support keeps you on track.