order to show cause n. a judge's written mandate that a party appear in court on a certain date and give reasons, legal and/or factual, (show cause) why a particular order should not be made. This rather stringent method of making a party appear with proof and legal arguments is applied to cases of possible contempt for failure to pay child support, sanctions for failure to file necessary documents or appear previously, or to persuade the judge he/she should not grant a writ of mandate against a governmental agency. (See: O.S.C.)