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Adjective: head-to-head  'hed-tu'hed
  1. Involving two persons; intimately private
    "a head-to-head conversation";
    - tête-à-tête
  2. Inconclusive as to outcome; close or just even in a race or comparison or competition
    "as they approached the finish line they were head-to-head";
    - neck and neck, nip and tuck [informal]
Adverb: head-to-head  'hed-tu'hed
  1. Even or close in a race or competition or comparison
    "the horses ran head-to-head";
    - neck and neck, nip and tuck [N. Amer, informal]

See also: inconclusive, private