Sentence:  I mean something more like Freud 's concept of the utility of `` <WSD>play</WSD> '' to a small child : he plays `` house '' or `` doctor '' 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:  activity by children that is guided more by imagination than by fixed rules