The word entendían is the imperfect form of entender in the third person plural.
See the full entender conjugation

entender

Ustedes no entendían lo que estaba tratando de transmitirles.
You did not understand what I was trying to convey.
Muchos habían vuelto a Turquía, y los demás no entendían nada.
A lot had returned to Turkey, and the others didn't understand.
Quizás no entendían las palabras, pero comprendían el significado.
They might not understand the words, but they understood the meaning.
No entendían sus derechos ni cómo funcionaba el sistema aquí.
They didn't understand their rights or the system here.
Los corinthians ellos mismos lo entendían para hablar de este modo.
The Corinthians themselves understood him to speak in this manner.
En el mundo antiguo, entendían la felicidad diferente que nosotros.
In the ancient world, they understood happiness differently than we do today.
Hablaban el mismo idioma y se entendían sin problemas.
They spoke the same language and understood each other without difficulty.
Tus padres no entendían eso, Pero yo sí.
Your parents didn't understand that, but I do.
Pero ellos no entendían esta palabra, y tenían miedo de preguntarle.
But they understood not that saying, and were afraid to ask him.
Has hecho cosas que que ellos realmente no entendían.
You had done things that... That they really didn't understand.
La mayoría de mis hombres no entendían las palabras que usaste.
Most of my men didn't even understand the words you were usin'.
Pero sobre todo, sabía que me entendían.
But above all, I knew that they understood me.
Las mujeres de Laketop no la entendían, de verdad.
The women at laketop didn't understand her, really.
Esto es lo que entendían y lo que querían.
That's what they understood, and that is what they wanted.
¡Cuando era más joven, las personas se entendían mejor!
When I was younger, people got along better!
Desafortunadamente, muy pocas personas le prestaban suficiente atención o la entendían.
Unfortunately, not very many people were paying enough attention or understood it.
Los sacerdotes obedecieron este mandamiento porque ellos entendían el significado de la luz.
The priests obeyed this command because they understood the meaning of the light.
Pero a este tiempo, sus discípulos no entendían sus palabras.
But at the time, his disciples did not understand what he was saying.
Ellos lo creían y aceptaban pero no lo entendían.
They believed it and accepted it, but they didn't understand it.
Porque es muy complicado y las personas no lo entendían.
It was too complicated. People didn't follow it.
Want to Learn Spanish?
Spanish learning for everyone. For free.
SpanishDict Premium
Have you tried it yet? Here's what's included:
Cheat sheets
No ads
Learn offline on iOS
Fun phrasebooks
Learn Spanish faster
Support SpanishDict