The term PILED ON can be defined as 'ADDED' (5 letters). It is a phrase used to describe the act of adding something to an existing situation or amount. For example, if someone is already feeling overwhelmed with work, then more work can be said to have been 'piled on'. It can also be used to describe the addition of extra layers or items to something, such as when extra blankets are piled on a bed to make it warmer.