cuchillo
knife
cut
to cut
+
-illo
diminutive suffix
Cuchillo means knife and can be remembered as a small thing that cut0s, with -illo1 being a diminutive suffix1.
noun
- knifeA sharp-edged cutting instrument used for cutting or as a weaponUsa un cuchillo afilado para cortar el pan. // Use a sharp knife to cut the bread.