head-to-head

Adjective head-to-head has 2 senses

• head-to-head(s = adj.all) tete-a-tete - involving two persons; intimately private; "a tete-a-tete supper"; "a head-to-head conversation"
• head-to-head(s = adj.all) neck and neck, nip and tuck - 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"

Adverbial head-to-head has 1 sense

• head-to-head(r = adv.all) neck and neck, nip and tuck - even or close in a race or competition or comparison; "the horses ran neck and neck"; "he won nip and tuck"