n a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator
n a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator
n understatement for rhetorical effect (especially when expressing an affirmative by negating its contrary)
saying `I was not a little upset' when you mean `I was very upset' is an example of litotes