The word movían is the imperfect form of mover in the third person plural.
See the full mover conjugation

mover

Los autos y la gente se movían en cámara lenta.
The cars and the people were moving in slow motion.
Y los árboles se movían, pero no había viento.
And the trees were moving, but there wasn't any wind.
He abierto la puerta, pero mis piernas no se movían.
I opened the door, but my legs wouldn't move.
He abierto la puerta, pero mis piernas no se movían.
I opened the door, but my legs wouldn't move.
Dijo que a veces parecía que las cosas se movían.
He said sometimes it looked like things were being moved.
No, a menos que se caiga cuando se movían usted.
Not unless it falling out when they were moving you.
Parecía que todos se movían en seis direcciones a la vez.
People seemed to be moving in six directions at once.
Era hermoso ver cómo se movían con tanta coordinación.
It was beautiful to see how they moved with so much coordination.
Las vacas se movían muy lentamente a través del largo pasto verde.
The cows were moving very slowly through the long green grass.
Había gotas extrañas, y se movían muy rápido.
They were strange drops, and they were moving very fast.
Sus labios se movían pero no pude entenderle.
His lips were moving but I couldn't understand him.
De hecho, él dijo que se movían como platillos saltando sobre el agua.
In fact, he said it moved like saucers skipping on water.
Cosas que se movían por meses, y la oía.
Things have been moving around for months, and I hear her.
Sus labios se movían, por supuesto miente.
His lips were moving, of course he's lying.
He salido con chicas que se movían menos que él.
I've gone out with girls with less movement than that.
Tus labios se movían, y salía sonido de ellos.
Your lips were moving and sound was coming out.
Las dos se movían por la casa en silencio.
Both would wander about the house silently.
No se movían mucho, pero ahí estaban.
They weren't moving much, but they were out there.
Sus labios se movían, por supuesto miente.
His lips were moving, of course he's lying
No movían un músculo, no decían una palabra.
Wouldn't move a muscle, wouldn't speak a word.
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