I heard someone telling "I beg your pardon."
What does it mean? Can I say it when asking somebody to repeat what she just said?
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Sign up to join this communityPardon (as noun) means "the action of forgiving somebody for something"; beg means "to ask somebody for something especially in an anxious way because you want or need it very much."
An equivalent sentence would be "I ask you to forgive me." even if this would not imply any anxious way.
If you just want to ask somebody to repeat something, you say "Pardon?" since pardon (as exclamation) means "used to ask somebody to repeat something because you did not hear it or did not understand it."
[A] You're very quiet today.
[B] Pardon?
[A] I said you're very quiet today.
"I beg your pardon?" can indeed be used if you'd like the speaker to repeat what they just said.
It can also be used when the listener objects to what the speaker just said (e.g. if a pupil said something rude to a teacher), where the tone of voice would make it clear how the listener feels about what he/she has just heard.
Note that although this phrase is probably widely understood, its use may vary depending on region. Alternatives include "sorry?" or "excuse me?", or simply, "could you repeat that, please?".