'head-to-head' definitions:

adverb

Even or close in a race or competition or comparison; "the horses ran neck and neck"; "he won nip and tuck" [syn: neck and neck, head-to-head, nip and tuck]

adjective

Involving two persons; intimately private; "a tete-a-tete supper"; "a head-to-head conversation" [syn: tete-a- tete, head-to-head]

adjective

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" [syn: neck and neck, head-to-head, nip and tuck]