late 14c., "break up military formation;" early 15c. in general sense "throw out of arrangement or into disorder;" see dis- "reverse of" + array (v.) "put in order, arrange." Perhaps formed on the analogy of Old French desareer. Related: Disarrayed.
late 14c., "disorder, confusion, condition of being out of regular order," from dis- "opposite of" + array (n.) "order, arrangement, sequence," or perhaps from Old French desarroi.