cowardly vs out on a limb

cowardly

adj
  • Showing cowardice; lacking in courage; weakly fearful. 

out on a limb

phrase
  • In a risky, precarious, daring, or uncompromising position, especially one outside of the mainstream; vulnerable. 

How often have the words cowardly and out on a limb occurred in a corpus of books? (source: Google Ngram Viewer )