How to Say "horizontal" in Spanish
The Spanish word for “horizontal” is “acostado” — A1 level. This is a very common word in everyday Spanish.

Examples
Mi padre está acostado en el sofá viendo la tele.
My father is lying down on the sofa watching TV.
¿Por qué estás acostado tan temprano? ¿Te sientes mal?
Why are you in bed so early? Do you feel sick?
Dejó la botella acostada para que no se secara el corcho.
He left the bottle lying down so the cork wouldn't dry out.
State vs. Action
Use 'estar acostado' to describe the current state of being (the position). This is different from the action of 'acostarse' (to lie down, to go to bed).
Agreement
Like all Spanish adjectives, 'acostado' must match the person or thing it describes: 'acostada' (f. sing.), 'acostados' (m. plural), 'acostadas' (f. plural).
Using Ser Instead of Estar
Mistake: “Mi perro es acostado.”
Correction: Mi perro está acostado. (Use 'estar' because 'lying down' is a temporary position or state, not a permanent characteristic.)
Related Translations
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