head-to-head in WordNet English dictionary

1. even or close in a race or competition or comparison
   "the horses ran neck and neck"; "he won nip and tuck"
   neck and neck  head-to-head  nip and tuck  neck and neck  head-to-head  nip and tuck 
   

1. inconclusive as to outcome; close or just even in a race or comparison or competition
   "as they approached the finish line they were neck and neck"; "the election was a nip and tuck affair"
   neck and neck  head-to-head  nip and tuck 
   
2. involving two persons; intimately private
   "a tete-a-tete supper"; "a head-to-head conversation"
   tete-a-tete  head-to-head 
   

head-to-head in English Wiktionary