a small problem or fault that stops something working successfully A few technical glitches forced us to postpone the demonstration. It was only a temporary glitch but it could have put people’s lives in danger. The new system has too many bugs and glitches to be trusted. Word Origin 1960s (originally US): of unknown origin. The original sense was ‘a sudden surge of current’, hence ‘malfunction, hitch’ in astronautical slang.