K
Keep in: To retain or maintain something within a confined space or boundary. He always keeps in his emotions and rarely shows them. Keep on: To continue doing something. Don't give up, just keep on trying. Keep up (with) : To maintain the same pace or level as. It's hard to keep up with the latest technological advancements. Knock down : To demolish or destroy. They plan to knock down the old building and construct a new one.