one on one
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1. Consisting of only two people, with one person's attention or energy focused solely on the other person. I make a point of offering one-on-one tutoring sessions for any student who feels like they need it. The store even has staff who give one-on-one advice on which product is right for someone.
2. In sports, (describing) a match-up in which two competitors compete directly against one another. This play is all about isolating the defender so you can go one-on-one. If they keep getting one-on-ones in the paint, they're going to dominate this game.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
one on one
A direct encounter between two persons, especially a conflict, as in The two department heads went one on one regarding shelf space. This slangy expression almost certainly comes from sports. It is commonly used to refer to a two-person basketball game, but is also applied to the interaction of two players on opposing teams in football, soccer, and similar team sports. [c. 1960]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
one on one (or one to one)denoting or referring to a situation in which two parties come into direct contact, opposition, or correspondence.
1995 Represent I wanna speak to God one on one me and him.
Farlex Partner Idioms Dictionary © Farlex 2017
one on one
A direct encounter between two persons. This expression was transferred to general use from several sports. In basketball it signifies an informal game with just two players. It also means the standard form of defense, in which one player guards one opponent. In football it similarly means a player covering (or being covered by) a single opponent. About 1960 it began to be used for nonathletic encounters, as in “Dean never liked a big party; he preferred social events where he could be one on one.”
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer