Questions & Answers about Lo siento, pero me ha salido otra reunión.
Lo siento is the standard way to say I’m sorry in Spanish.
The lo does not mean it in a very concrete, literal way here, even though historically that is where it comes from. The verb sentir means to feel, so lo siento is literally something like I feel it, but in modern Spanish you should learn it as a fixed expression meaning I’m sorry.
So in this sentence, Lo siento, pero... is a polite way to soften what comes next.
Literally, it is something like:
- me = to me / for me
- ha salido = has come up / has appeared / has arisen
- otra reunión = another meeting
So the idea is: another meeting has come up for me.
In natural English, you would usually translate it as another meeting has come up rather than keeping the literal structure.