Fr. On; upon; over. In the titles of real actions “sur” was used to point out what the writ was founded upon. Thus, a real action brought by the owner of a re- version or seigniory, in certain cases where his tenant repudiated his tenure, was called “a writ of right sur disclaimer.” So, a writ of entry sur disseisin was a real action to re- cover the possession of land from a disseisor. Sweet.
Black’s Law Online Dictionary
