hugger-mugger vs sly as a fox

hugger-mugger

adj

  • Secret, clandestine, sly. 

  • Disorderly, chaotic, confused. 

verb

  • To meet or act secretly. 

adv

  • Secretly. 

  • Confusedly, in a muddle. 

noun

  • Disorder. 

sly as a fox

adj

  • Very sly, very cunning. 

How often have the words hugger-mugger and sly as a fox occurred in a corpus of books? (source: Google Ngram Viewer )