cloak-anddagger vs underhand

cloak-anddagger

underhand

verb
  • To trick, deceive or gull. 

  • To toss or lob with an underhand movement. 

  • To excavate downward in successive steps or horizontal slices while positioned above on unbroken ore. 

noun
  • The lower of two hands, the hand under the work. 

adv
  • in a sly, sneaky or secret manner 

  • with an underhand movement 

adj
  • secret; clandestine 

  • dishonest and sneaky; done in a secret or sly manner 

  • thrown (etc.) with the hand brought forward and up from below 

How often have the words cloak-anddagger and underhand occurred in a corpus of books? (source: Google Ngram Viewer )