corked up vs dumb as a post

corked up

adj

  • Unable to speak; silenced. 

  • Stoppered with a cork. 

dumb as a post

adj

  • Utterly mute; lacking the ability to speak. 

  • Extremely stupid. 

How often have the words corked up and dumb as a post occurred in a corpus of books? (source: Google Ngram Viewer )