The word pesaba is the imperfect form of pesar in the first person singular. There are other translations for this conjugation.
See the full pesar conjugation

pesar

Pero tres años después, para 1908, ya pesaba 40 libras.
But three years later, by 1908, it weighed 40 pounds.
Es que una experiencia muy dura pesaba sobre ellos.
It was that a very hard experience weighed on them.
La gran obra de la redención pesaba continuamente sobre su alma.
The great work of redemption weighed continually upon His soul.
Yo no sabía que cada uno pesaba varias toneladas, ¿sabes?
I didn't know that every cannon weighs several tons, you know?
Yo solo pesaba 120 libras cuando estaba en la Facultad.
I only weighed 120 pounds when I was in high school.
Probablemente pesaba el doble por lo menos cuando estaba con vida.
He probably weighed twice as much when he was alive.
Cuando tenía catorce años, pesaba solo 90 libras.
When he was fourteen, he only weighed 90 pounds.
No sé por qué pesaba en el que uno.
I don't know why I weighed in on that one.
El coche pesaba tanto, y yo no podía girar el volante.
The car was so heavy, and I couldn't turn the wheel.
Cuando yo tenía 10 años, pesaba 90 kilos.
When I was 10 years old, I weighed 200 pounds.
¿Por qué crees que mi maleta pesaba tanto?
Why do you think my suitcase was so heavy?
Quiero decir, sé lo mucho que pesaba sobre usted.
I mean, I know how heavily that weighed on you.
Así pesaba el Maestro el grado de la traición.
Thus the Teacher weighed the degree of betrayal.
Que una de las botellas pesaba tanto que no podía caerse.
That one of the bottles was weighted so it couldn't fall over.
Cuando se ha casado, pesaba aproximadamente 135 libras.
When she got married she weighed about 135 pounds.
Estaba lloviendo, y mi bolso pesaba mucho.
It was raining, and my bag was really heavy.
La novia era mayor que yo y pesaba más que yo.
The bride was older than me and she weighed more than me.
Esa pregunta pesaba en el ambiente y alimentaba la zozobra.
These questions weighed in the air, feeding anxiety.
Mi hija pesaba ocho libras al nacer.
My daughter weighed eight pounds at birth.
El coche pesaba tanto, y yo no podía girar el volante.
The car was so heavy, and I couldn't turn the wheel.
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