The word subas is the present subjunctive form of subir in the second person singular. There are other translations for this conjugation.
See the full subir conjugation

subir

Pero tenemos que hablar antes de que subas al avión.
But we need to talk before you get on the plane.
Es hora que te subas a un avión y vuelvas.
It's time you got on a plane and came back.
El juez no va a dejar que subas al estrado.
The judge isn't gonna let you get in the box.
Debe ser importante para que subas a un avión.
Must be something important to get you on a plane.
Es hora de que subas a un avión y regreses.
It's time you got on a plane and came back.
Eso significa que no subas por el ascensor para verme.
That means no coming up in the elevator to see me.
Probablemente quieran asegurarse de que te subas a ese avión.
They probably want to make sure you get on that plane.
No, quiero decir, después de que subas una foto aquí.
No, I mean, after you post a picture here.
Tan solo deja tu teléfono cuando te subas al ascensor.
Just leave your phone behind when you get in the elevator.
No subas de tu reverencia hasta que yo te salude.
Don't get up out of your curtsy till I bow.
Y no subas al avión hasta que llegue allá.
And don't get on the plane till I get there.
Pero no te lo comas hasta que subas al avión.
Okay, but don't eat it till you get on the plane.
Te daré tres segundos para que te subas la manga.
I'll give you three seconds to roll up your sleeve.
Quiero asegurarme de que subas a ese avión.
I want to make sure you get on that plane.
Anna, será mejor que subas y te vayas a la cama.
Anna, you'd better go upstairs and go to bed.
Y hagas lo que hagas, nunca te subas a su auto.
And whatever you do, don't ever get into his car.
Sí, y tú vas a caerte, no te subas ahí.
Yeah, that you're going to fall... Don't go up there.
No te subas a ese techo hasta que deje de llover.
Don't get up on that roof till it stops raining
Es mejor que subas tu responsabilidad en un caballo.
You'd better get your responsibility on a horse.
Ya sabes lo que dicen... no subas más alto que DI.
You know what they say... don't go higher than a DI.
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