The definition of loose movements, also referred to as diarrhoea, is loose, watery faeces (stools). A person is said to have loose movements if they have three or more instances of loose stools in one day. 1 There are many different causes of loose motion, and they typically disappear on their own within one to three days. However, when you have loose motions, which may happen more frequently than usual, you might need to immediately use the restroom.