刎

cut across (throat)

刎 character breakdown

刎
- 刂
  - 丨
  - 亅
- 勿
  - 丿
  - 勹
    - 丿
    - ㇆
      - 一
      - 亅

da̅o = d + ao1

Kangxi radical 18 (刀[dao1]) as a vertical side element / see also 立刀旁[li4 dao1 pang2] / see also 側刀旁|侧刀旁[ce4 dao1 pang2]

刂 = 丨 + 亅 : Mnemonic symbol: a kitchen knife. Don Quixote (d) is showing off his special knifes in front of the aorta (ao1). One is made from a dinosaur bone (丨), and the other is made from a crowbar (亅).

勿

wù = w + Ø4

do not

勿 = 丿 + 勹 : Mnemonic symbol from the shape of the character: bat wings. The 丿 strokes look like the fingers of a single bat wing.

The elephant (勹) wants to eat a banana (丿) in the space station's bathroom (Ø4), but Willy Walrus (w) suddenly flies by (using bat wings (勿)), snatches the banana away and shouts "do not!" (勿)