cidni -cid- gismu

x1 is a/the knee/elbow/knuckle [hinged joint, body-part] of limb x2 of body x3.

Metaphor: a sharp bend/curve. See also korcu, jarco, jganu.


In notes:

cidydzu
ca1=ci3 crawls on surface ca2.
xancidni
x1=c1 is a wrist of x2=c2.