The common phrase "putting one's John Hancock on" refers to a signature that a person would put on a document. The phrase is named after John Hancock, one of the signers of the American Declaration of Independence, who signed his name in large letters. However, there are several antonyms for this phrase. The opposite of putting one's signature or mark on a document is to refuse, decline, or reject it. One might also choose not to endorse, authorize, or approve the document, or even outright oppose it. There are a variety of reasons why someone might choose not to put their John Hancock on a document, including privacy concerns or a disagreement with the document's content.