dumb as a bag of hammers vs one brick short of a full load

dumb as a bag of hammers

adj

  • Remarkably stupid. 

one brick short of a full load

adj

  • Stupid. 

  • Not mentally sound; insane. 

How often have the words dumb as a bag of hammers and one brick short of a full load occurred in a corpus of books? (source: Google Ngram Viewer )