head-to-head vs nip and tuck

head-to-head

adv

  • Directly, one-to-one. 

  • Facing one another. 

adj

  • Direct, one-to-one. 

nip and tuck

adv

  • With the advantage changing hands, or shifting back and forth among the available alternatives. 

adj

  • So evenly matched that the advantage shifts from one to the other, and the outcome is uncertain. 

noun

  • Minor cosmetic surgery that tightens loose skin. 

How often have the words head-to-head and nip and tuck occurred in a corpus of books? (source: Google Ngram Viewer )