The term 'KEEP FROM FLOWING' can be solved by three crossword solutions: DAM (3 letters), STEM (4 letters), and DAMUP (5 letters). A DAM is a barrier built across a river or other body of water to control the flow of water. It is usually made of concrete, earth, or other materials. A STEM is a vertical structure that supports a plant or tree. It is also used to refer to the main trunk of a river or stream. Finally, damming up is the process of constructing a DAM to control the flow of water.