The word posó is the preterite form of posar in the third person singular.
See the full posar conjugation

posar

Uno se posó en su cuna el día que nació.
One landed on his crib the day he was born.
Nuestra clase entera posó en una foto con usted.
Our entire class posed for a photo with you.
Por supuesto, Ud. posó para ese cuadro del estudio.
Of course, you sat for that painting in his study.
Si alguna vez posó para un retrato, éste ya no existe.
If he ever sat for a portrait, it no longer exists.
¿Me está diciendo que nunca posó para usted?
Are you telling me that she never posed for you?
La pluma no se posó en él, y te vi hacer trampa.
The feather didn't land on him, and I saw you cheat.
Me pregunto si posó para esa pintura.
I wonder if she posed for that painting.
Creo que el rey posó sus ojos en Christine.
I believe that the king's eye has fallen on Christine.
Ella posó para mí algunas veces, es cierto.
She posed for me a few times, yeah.
La brecha no posó un peligro de seguridad.
The breach did not pose a safety hazard.
Chalet independiente, tranquila y romántica, posó en medio de los viñedos.
Holiday house independent, quiet and romantic, posed in the middle of the vineyards.
La hizo tu propio abuelo, y tu abuela posó para ello.
Your own grandfather made it, and your own grandmother posed for it.
Mi padre posó su mano sobre mi hombro.
Father laid his hand on my shoulder.
Un petirrojo bonito se posó en el antepecho de mi dormitorio.
A pretty robin landed on my room's windowsill.
Una mosca se posó en mi tarta.
A fly landed on my pie.
Y sí; ella posó para mi.
And yes, she did pose for me.
Luego posó en mí los ojos y sonrió.
Then he glanced at me and smiled.
Nathan hizo detenerse a Catalina y posó las manos sobre su hombro.
Nathan stopped Catalina and facing her, put his hands on her shoulders.
Por lo que no se posó en un fluido.
So it wasn't fluid that we landed in.
Mi vecino posó para esto.
My neighbor posed for that.
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