olvidar
/olbiˈdaɾ/ · A1 · verb
to forget
Latin oblitare, from oblitus (forgotten) — same root as oblivion
Olvidar comes from Latin oblitus, the root of English oblivion and oblivious; the b and l swapped places (obl- became olv-). To forget something is to send it to oblivion. Se me olvidó = it slipped away from me.