Facing one another. / Directly, one-to-one.

(idiomatic) To sacrifice someone, especially in an attempt to save oneself.

direct, forthright, and honest / (sports) one-on-one

directly, forthrightly, and honestly

(auxiliary) Indicating duty or obligation. / (auxiliary) Indicating advisability or prudence. / (auxiliary) Indicating desirability. / (auxiliary) Indicating likelihood or probability.

Close together, within arm's reach. / Especially, describing fighting (armed or unarmed) done within reach rather than at range.

Used on television or radio to indicate a change to another reporter or commentator.

(of a Salvationist) To cause to die

To put different items or groups together and regard or treat them as one single group.

On the point of crying due to strong emotion, either happy or sad.