lo que decían

what they were saying

→ lo
phrase Rare #33,066
what they were saying Refers to the things they were saying. Depending on context, it can also mean “what they said.”
SP: No entendí lo que decían.
EN: I didn’t understand what they were saying.

Los guardias podían oír todo lo que decían.

The guards could hear everything they were saying.

Lo que decían no era cierto.

What they were saying wasn’t true.

Estaban Pete Thorpe, Hashmi y otro más escuchando lo que decían.

Pete Thorpe, Hashmi, and one other person were listening to what they were saying.

— Kajaki (2014)

No pude oír lo que decían.

I couldn't hear what they were saying.

Un verdadero artista, por lo que decían.

A true artist, they said.

Se inclinó hacia adelante para escuchar mejor lo que decían en voz baja.

He leaned forward to hear better what they were saying in hushed tones.

Es lo que decían.

That's what they said.

— Los Tenenbaums. Una familia de genios (2001)

No entendía lo que decían.

I didn't understand what they were saying.

— Hermano 2 (2000)