"In the revolt against idealism, the ambiguities of the word experience have been perceived, with the result that realists have more and more avoided the word"

This quote by Bertrand Russell is describing the philosophical movement of realism, which is a reaction versus idealism. Idealism is the belief that truth is made up of ideas, while realism is the belief that truth is made up of physical things. In the revolt against idealism, realists have become conscious of the obscurities of the word "experience," which is typically used to refer to both physical and mental experiences. As a result, realists have ended up being significantly cautious of using the word "experience" and have actually instead chosen more precise terms to explain their beliefs. This quote highlights the value of being accurate when discussing philosophical principles, as using unclear terms can result in confusion and misconception.