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English definition of “one-on-one”

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one-on-one

adjective [before noun] uk   /ˌwʌn.ɒnˈwʌn/ us    /-ɑːn-/
( UK also one-to-one) A one-on-one activity involves two people talking directly, usually with one teaching or giving information to the other: Each employee has a one-on-one performance review with his or her boss.

one-on-one

adverb uk   /ˌwʌn.ɒnˈwʌn/ us    /-ɑːn-/
( UK also one-to-one) If two people discuss something one-on-one, they discuss it directly, without involving anyone else: It's best to talk with him about the problem one-on-one. US In sports, if something is done one-on-one, it means that each player from one team is matched to a single player from the other team.

one-on-one

noun [C] uk   /ˌwʌn.ɒnˈwʌn/ us    /-ɑːn-/ ( plural one-on-ones)
( UK one-to-one) a discussion or meeting between two people, without anyone else involved: As well as general meetings, the president had one-on-ones with the other leaders.
(Definition of one-on-one from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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