sign vt1 : to affix a signature to
: ratify or attest by hand or seal [ a bill into law]
: to write or mark something (as a signature) on (a document) as an acknowledgment of one's intention to be bound by it
2 : to assign or convey formally [ed the property over to his brother]
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.