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sign something for someone
1. to sign one's signature on a paper in place of someone else's signature. Would you please sign this for me? I can't sign it right now. Would you sign it for me?
2. to sign a paper for another person, using that person's name, adding the phrase "by [one's own name]." When the delivery comes, will you please sign my name for me? I signed Ted's name for him.
sign for someone
to sign something, using one's own signature in place of someone else's signature; to sign something, using another person's name, adding the phrase "by [one's own name]." He's not here. I will sign for him. Where do I sign? Who will sign for Mr. Wilson?
sign for something
to sign a piece of paper indicating that one has received something. Would you sign for this, please? Ted signed for the package and opened it up.
To accept some delivery by signing a document: I went to the door to sign for the package.