The intent of this research was to examine the concept of overusage according to AL-Farra` through picking up the linguistic phenomena that he subjucated to the domination of usage and / or overusage and surveyed them interpretably so that he might support his doctrine and construct his principle. The research also brought into view that AL-Farra` was a precursor in admitting that language is subjucated to the effect and interference of usage on directing what was on everybody`s lips or what was frequently used or repeated for the more a thing is overused or is plain in meaning, the mild it will be in speaking and it will become much more permissible than any others.