In a nutshell, the lowest common denominator method is when you use the least amount of words possible for your negative keywords. Most of my negative keywords are one single broad match word.

Even within attendance boundaries, public schools aren’t designed to serve every child, but rather the lowest common denominator—or lowest common denomination.

Democrat Senator Mazie Hirono of Hawaii called out President Donald Trump for reaching the “lowest common denominator” in his attacks against Brett Kavanaugher’s accuser Christine Blasey ...