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speak for (one)
1. To say something on behalf of one; to express one's opinions for them. I can't speak for Dave, but I know that I'm very uncomfortable with this arrangement. I would just like to make clear that this former employee does not speak for me or the company as a whole.
2. To testify, argue, or give a recommendation in support of one. Melissa's a fantastic worker. I can't speak for the other interns, though, as I haven't spent any time working with them. I don't need anyone to speak for me—I can stand up for myself.
See also: speak
1. Already claimed, purchased, or reserved. I'm sorry, this seat is spoken for. It looks like this car is spoken for. Let's see if they have any others for a good price.
2. Already in a romantic relationship. I'm thinking of asking John out. Do you know if he's spoken for?
taken; reserved (for someone). I'm sorry, but this piece of cake is already spoken for. Pardon me. Can I sit here, or is this seat spoken for?
Reserved or requested: Is that seat spoken for?