faltar
to lack, to be missing, to miss (an event)
verb a2
Translation
to lack, to be missing, to miss (an event)
Explanation
No tener algo necesario o no estar presente en un lugar o evento.
Examples
Me falta dinero para comprarlo.
Faltó a la reunión.
Memory Aid
Sounds like 'fault' — if there's a fault something's missing. (faltar = to lack / be missing)