De collate is a term commonly used in law and refers to the cancellation or annulment of a legal instrument, such as a will or contract. Synonyms for this term include revoke, nullify, abolish, abrogate, rescind, invalidate, cancel, and void. These words all convey the idea of undoing or negating the effects of a legal document or decision. Other related terms include repeal, annul, and reverse. It is important to note that while these terms may be interchangeable in certain contexts, they each have their own specific nuances and should be used appropriately.