At least 35 angry party chairmen signed a letter warning he is out of touch and will cost them the next election.
The Sun (2013)
Nearly 100 clergy had signed the letter by last night.
Times, Sunday Times (2012)
A group of consultants at the hospital signed a letter attacking her management of the hospital.
Times, Sunday Times (2012)
Seeopen a letter
Definition of 'sign'
sign
(saɪn)Explore 'sign' in the dictionary
verb
When you sign a document, you write your name on it, usually at the end or in a special space. You do this to indicate that you have written the document, that you agree with what is written, or that you were present as a witness.