sapin noun English. One who has a speech impediment, esp. cannot pronounce l and r correctly. Example sentence: Subanen. Ki sapin, ndi' metau mektalu' dun kig liteda R. Sa' mektalu'i sapin, pinenggi' melaaten, meyaaten. English. A person with a speech impediment cannot say the letter R, For example if he says melaaten bad, it is meyaaten.