签名

May I have your signature/autograph, sir?

He signed his name on the document.

The book bears the author's authentic/genuine signature.

come into force upon signature

put one's signature to a book; inscribe one's name in a book; (of an author) autograph one's book

sign a contract/cheque

sign in one's handwriting; sign one's autograph; sign manual

celebrity autograph

holder's signature

consent by signature

give one's autograph as a memento

sign and seal; put one's signature and seal on

collect signatures (for)

forge a signature

get/obtain sb's signature/autograph