How to Say "slipped away" in Spanish
The Spanish word for “slipped away” is “escapó” — B1 level.

Examples
Se le escapó la respuesta correcta en el examen.
The correct answer slipped his mind during the exam. (Literally: The answer escaped him.)
El secreto escapó antes de que pudieran detenerlo.
The secret got out before they could stop it.
La oportunidad de viajar escapó de sus manos.
The opportunity to travel slipped through his hands.
The 'Accidental Se' Construction
When used to mean 'slipped away' or 'forgotten,' 'escapó' often uses the structure 'se le' (or 'se me', 'se te', etc.). This highlights that the event was accidental or unintentional, making the answer or opportunity the 'subject' doing the escaping.
Direct Translation
Mistake: “Saying 'Él escapó la oportunidad' (He escaped the opportunity).”
Correction: Use the accidental structure: 'Se le escapó la oportunidad' (The opportunity escaped him/slipped away from him).
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