cabilla
pin
caber
to fit
+
-illa
diminutive suffix
A cabilla is a pin, which can be thought of as a small thing that fits0 (caber0) into something, with the -illa1 suffix indicating its small size1.
noun
- pinA wooden or metal pin used in construction or shipbuilding.El carpintero usó una cabilla para unir las piezas de madera. // The carpenter used a pin to join the wooden pieces.