head-on vs upfront

head-on

adv
  • With direct confrontation. 

  • With the front of a vehicle. 

noun
  • A collision from the front. 

adj
  • Of a collision, from the front or in the direction of motion. 

  • Direct, abrupt, blunt or unequivocal; not prevaricating. 

upfront

adv
  • As an attacker. 

  • beforehand 

verb
  • To bring to the fore; to place up front for consideration 

noun
  • A meeting of network executives with the press and major advertisers, signaling the start of advertising sales for a new season 

adj
  • Honest, frank and straightforward. 

  • In a forward, leading or frontward position. 

  • Paid in advance. 

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