I mean / That is to say
One of the most common fillers in Spanish. Used to clarify, rephrase, or soften what was just said. Equivalent to 'I mean' or 'like' in informal English.
I mean, it's not that I don't want to go, it's that I can't.
—Did you like it? —I mean, it was fine, but it didn't excite me.
He's very friendly, I mean, everyone loves him.
I don't like it, I mean, I prefer something different.
We're going on Monday, that is, in two days.