ABEND [ABnormal END] /o'bend/, /*-bend'/ n. Abnormal termination (of software); crash; lossage. Derives from an
error message on the IBM 360; used jokingly by hackers but
seriously mainly by code grinders. Usually capitalized, but may
appear as `abend'. Hackers will try to persuade you that ABEND is
called `abend' because it is what system operators do to the
machine late on Friday when they want to call it a day, and hence
is from the German `Abend' = `Evening'.