fallar
verbo intransitivo
1 [+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
2 (defraudar)
fallar a algn to let sb down; fail sb; me has fallado de nuevo you've let me down again; mañana hay reunión, no me falles there's a meeting tomorrow, don't let me down
