Where does “falla” come from?

falla (Old Portuguese) comes from Vulgar Latin fallia, from Latin fallēre.

Ancestry of “falla”, step by step

StepLanguageWordMeaning
1Vulgar Latinfalliadefect
2Latinfallēre—
Every word from Latin fallēre →Every word from Vulgar Latin fallia →
falla — Etymology, Origin & Word History | Etymology Explorer