Catch a bug is an idiom that means to find and fix a problem or error in a computer program. The crossword solutions for this term are AIL and EAR. AIL stands for 'afflict with pain or distress' and EAR stands for 'organ of hearing'. Together, these two words can be interpreted as finding and fixing a problem or error in a computer program can be a painful and difficult process, but it is necessary to ensure the program works properly.