The word subí is the preterite form of subir in the first person singular. There are other translations for this conjugation.
See the full subir conjugation

subir

Me subí a una bicicleta y fui tras el ladrón.
I got on a bicycle and chased after the thief.
Yo,... subí al avión a las 11:15 en San Francisco.
I, um... got on the plane at 11:15 in San Francisco.
Y por la mañana, cuando subí a jugar con Ramona...
And in the morning, when I went upstairs to play with Ramona...
Me subí a una silla y corté la cuerda.
I got on a chair and cut the rope off.
Puede que no estuviera en el tren cuando yo subí.
Maybe he wasn't on the train when I got on.
Pero un día, subí el volumen de mi ordenador.
But one day, I turned the volume of my computer up.
Así que me subí al escenario y le susurró a ella...
So I went up on stage and whispered to her...
Oye, me subí a bordo en el último momento.
Hey, I came on board at the last minute.
Pero me colé en su habitación y subí la calefacción.
But I broke into her room and turned up the heat.
Empaqué mis maletas y me subí a un autobús.
I just packed my bags and got on a bus.
Fue la primera vez que subí a un coche.
It was the first time I ever rode in a car.
La mañana próxima subí a la cumbre de la isla.
Next Morning I climbed to the summit of the island.
¿Recuerda la primera vez que subí a bordo del Enterprise?
You remember when I first came on board the Enterprise?
Cuando me subí en el coche, le di mi dirección.
When I got in the car, I told him my address.
Así que me subí a la parte trasera de su motocicleta.
So I climbed on the back of his motorcycle.
Porque no estaba segura hasta que subí al tren.
Because I wasn't sure until I got on the train.
Después de la reunión, solo me subí al carro y conduje.
After the meeting, I just got in the car and drove.
Que no me subí al avión para visitar a mi marido.
That I didn't get on the plane to visit my husband.
Y por esa época, me subí a la balanza.
And about that time, I got on the scales.
¿Por qué crees que me subí a tu carro?
Like, why do you think I got in your car?
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