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QUICK ANSWER
"Lo que pasó" is a phrase which is often translated as "what happened", and "qué pasó" is a phrase which is also often translated as "what happened". Learn more about the difference between "lo que pasó" and "qué pasó" below.
lo que pasó(
loh
keh
pah
-
soh
)A phrase is a group of words commonly used together (e.g., once upon a time).
a. what happened
Por favor tranquilícese y cuéntenos lo que pasó.Please calm down and tell us what happened.
qué pasó(
keh
pah
-
soh
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. what happened
¿Y? ¡Cuéntame! ¡Muero por saber qué pasó!So? Tell me! I'm anxious to hear what happened!