Spanish phrase
No lo sé.
Meaning
I don't know.
When to use it
Expresses lack of knowledge. Used to answer everyday questions in a neutral, straightforward way, with more polite phrasing expected in formal contexts.
Example dialogue
¿A qué hora empieza la película?
What time does the movie start?
No lo sé, pregúntale a la taquilla.
I don't know, ask the box office.