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[freno] to fail
[plan] to fail, go wrong
[cuerda] to break, give way
[motor] to misfire
le falla la memoria his memory is failing
si no me falla la memoria if my memory serves me correctly o right o well
si no me falla la vista if my eyes don't deceive me
le falló el corazón his heart failed
me fallaron las piernas my legs gave way
algo falló en sus planes something went wrong with his plans
han fallado todas nuestras previsiones all our predictions have turned out to be wrong
si le das un caramelo se calla, no falla nunca if you give him a sweet he'll shut up, it never fails
no falla, ya has vuelto a llegar tarde * I knew it, you're late again