Collins COBUILD Advanced Learner's English Dictionary - one-on-one

A one-on-one situation, meeting, or contest involves only two people. ...a one-on-one therapy session. = one-to-one ADJ: usu ADJ n • One-on-one is also an adverb. Talking one-on-one with people is not his idea of fun. ADV: ADV after v • One-on-one is also a noun. Holloway was beaten in a one-on-one with Miklosko just before half-time. N-SING: oft N with n