engordarás
-you will gain weight
The word engordarás is the future form of engordar in the second person singular. There are other translations for this conjugation.
See the full engordar conjugation

engordar

Cuanto más chocolate comas, más engordarás.
The more chocolate you eat, the fatter you'll get.
A sus órdenes... o casi vivirás cien años, hijo mío, y cada día engordarás una libra.
At your service...so to speak....and you will live to be 100 years old, my son,...and every day you will become one pound heavier.
Como sigues haciendo ejercicio, no engordarás.
As you go on exercising, you won't put on weight.
Engordarás un poco y serás una mujer.
You know, a little more meat on you, and you'd be lots of woman.
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