skuro -ku'o- gismu

x1 is a groove/trench/furrow [shape/form] in object/surface x2.

See also plixa.

In notes:

plixa
x1 (agent) plows/furrows/tills [cuts into and turns up] x2 with tool x3 propelled by x4.
molku'o
m1=s1 is a philtrum (infranasal depression) of m2=s2.
tolku'o
k1 is a ridge in/on object/surface k2.