Sentence:  I mean something more like Freud 's concept of the utility of `` play '' to a small child : he plays `` house '' or `` <WSD>doctor</WSD> '' or `` fireman '' as a way of mastering slightly frightening experiences , reliving them imaginatively until they are under control . 
Meaning of the word marked with <WSD> tags:  children take the roles of physician or patient or nurse and pretend they are at the physician's office