do not
Depicts a knife (刀) cutting with drops of blood coming out, based on the original meaning "cut throat", now written as 刎. The current meaning is a phonetic loan.
《說文》：“勿，州里所建旗。象其柄，有三游。雜帛，幅半異。所以趣民，故遽稱勿勿。，勿或从。”
cut throat