Nothing funny about feldspar

From NPR’s Weekend Edition Sunday:

Next Week’s Challenge

From Eric Berlin of Milford, Conn.: Take a common two-word phrase with four letters in each word. Each word has a single O as its vowel. If you add an R somewhere in the second word, the two words become opposites. What is the phrase?

Another simple answer. It’s taking me longer to write this post than it took to solve the puzzle. I understand they want lots of participation, but “challenge” it ain’t.

long shot -> long short