What does currebant mean in latin?

There are two ways to translate this verb. They both mean pretty much the same thing, except it slightly changes the meaning of the sentence depending on which way you choose. Here are your options, as follows:

They were running

or

They used to run

Currebant is a declined form of curro, currere. The 'ba' section indicates that it is an imperfect verb, to be translated with a 'was', 'were' or a 'used to'. The 'nt' is a personal ending. To be specific, it is the third person plural, translated as 'they'.

Hope this helps :)