be bent, slope, capture
勾 centers on a curved or hooked shape that can catch or slope. Being bent is the core idea, from which sloping and capturing naturally follow.
勾 is thought to depict a bent or hooked shape, with 勹 representing a wrapping curve and 厶 possibly a bent object inside. The exact historical development is uncertain.
The outer 勹 wraps around like a hook, and the inner 厶 looks like a bent arm. Together they form a shape that is bent, sloping, and ready to capture something.
For コウ, imagine a coat hook bent into a curve: coat -> コウ, and the hook captures your jacket on the slope.
detention pending trial; confinement; custody
slope; incline; gradient; grade; pitch
magatama; comma-shaped bead from prehistoric Japan, usually made of jade
uphill grade; upgrade
downhill grade; downgrade
large jewel; string of jewels
contragradient method; conjugate gradient method; CG method
arrest; custody; apprehending; abduction
kidnapper
to kidnap
summons; warrant of arrest
detention warrant
three sides of right triangle (minor cathetus, major cathetus and hypotenuse)
Pythagorean theorem
sloping ceiling
vanishing gradient problem (in machine learning)
steep slope
draft angle
spatial gradient
nonlinear conjugate gradient method