abend vs tail end

abend

• Termination of a process prior to completion. 

• The abnormal termination of a program. 

• To terminate abnormally. 

tail end

• The last part of a period of time, event, or situation; the concluding or final part. 

• The hindmost part of anything (a person, animal, or object), the rear end; the butt, buttocks; hindquarters, rump.