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1945, of machine systems, from de- + bug (n.) "glitch, defect in a machine." Meaning "to remove a concealed microphone" is from 1964. Related: Debugged; debugging.
software, tool The bundled compiler/assembler for DOS/Windows after CP/M. [Did CP/M have "DEBUG"?] ["DOS Power Tools, Techniques, Tricks, and Utilities, PC Magazine, Paul Somerson Executive Editor, Bantam Books, 1988]. (2003-06-17)