How to Say "to stalk" in Spanish
The Spanish word for “to stalk” is “acechar” — B1 level.

Examples
El gato acecha al ratón detrás del sofá.
The cat is stalking the mouse behind the sofa.
Los leones acechan a su presa en la sabana.
Lions stalk their prey in the savanna.
Sentía que alguien lo acechaba desde las sombras.
He felt like someone was lying in wait for him from the shadows.
Using the 'Personal A'
Since 'acechar' usually involves watching a person or an animal, you must use the word 'a' after the verb. For example: 'Acecho a mi hermano' (I am spying on my brother).
No Prepositions Needed
In English, we say 'to lie in wait FOR someone.' In Spanish, 'acechar' already includes the idea of 'for,' so you don't need a word like 'por' or 'para' after it.
Don't confuse with 'asechar'
Mistake: “Using 'asechar' to mean stalking.”
Correction: Use 'acechar' (with a 'c'). Although they sound the same in many regions, 'asechar' is a much rarer word meaning to set a trap or trick.
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