The crossword solution for the term 'Retard in Movement' is 'IMPEDE'. IMPEDE means to slow down or obstruct progress. It can be used as a verb or a noun, and is often used in reference to physical movement, such as when someone is trying to move quickly but is hindered by an obstacle. It can also be used to describe a person's mental or emotional progress, such as when someone is trying to make a decision but is hindered by their own doubts or fears.