notch

nouns

a V-shaped indentation
"mandibular notch"
is a type of (narrower)
a concave cut into a surface or edge (as in a coastline)
the location in a range of mountains of a geological formation that is lower than the surrounding peaks
"we got through the pass before it started to snow"
a V-shaped or U-shaped indentation carved or scratched into a surface
"there were four notches in the handle of his revolver"
is a type of (narrower)
a concave cut into a surface or edge (as in a coastline)
a small cut

verbs

cut or make a notch into
"notch the rope"
is a type of (narrower)
make an incision into by carving or cutting
notch a surface to record something
is a type of (narrower)
make a record of; set down in permanent form