刎頚 （フンケイ） decapitation

刎頚の友 （フンケイノトモ） inseparable friend, sworn friend

自刎 （ジフン） committing suicide by slitting one's throat

撥ねる （はねる） to hit (e.g. to have a car hit someone), to run into, to reject, to deny, to refuse, to eliminate, to exclude, to leave out, to flip, to splash, to splatter, to decapitate, to behead, to jump up, to point or curl up (e.g. ends of hair)