(dialect) an opening at the bottom of a dike for letting water in or out / small channel across a river embankment / (used in place names) / Taiwan pr. [dou1]
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).