This is the 1965th most frequent Spanish word.
trabajaba
"Trabajaba" means "was working" or "used to work" in English.
The word 'trabajaba' here is used in the imperfect tense to describe a repeated or habitual action in the past.
Cuando era más joven, trabajaba en una biblioteca.
When I was younger, I used to work in a library.
In this sentence, 'trabajaba' again reflects a continuous action in the past which contrasts with another activity.
Aunque trabajaba mucho, siempre encontraba tiempo para sus amigos.
Although they worked a lot, they always found time for their friends.
Here, 'trabajaba' conveys the ongoing nature of the action within the context of regular occurrences in the past.