one-to-one

/ˌwʌntəˈwʌn/ adjective [before noun]

Definition

› used to describe the fact of one thing being worth the same as the second: The old banknotes were exchanged for the new at a one-to-one rate.

› (US one-on-one) MEETINGS involving only two people: one-to-one training a one-to-one meeting

(Definition of one-to-one adjective from the Cambridge Business English Dictionary © Cambridge University Press)

to do something that spoils someone's plans

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