Definition of 'one-on-one'

Adjective

1. directly between two individuals; "one-on-one instruction"
2. being a system of play in which an individual defensive player guards an individual offensive player; "one-on-one defense"
      Synonyms: man-to-man

Adverb

1. (of two persons) in direct encounter; "preferred to settle the matter one-on-one"; "interviewed her person-to-person"
      Synonyms: person-to-person

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