From Longman Dictionary of Contemporary Englishman-to-manˌman-to-ˈman adjective [only before noun] informal 1 TALK TO somebodyif two men have a man-to-man talk, they discuss something in an honest direct way2 playing a sport in such a way that one person on your team tries to stay close to one person on the other team —man-to-man adverb You two need to discuss this man-to-man.
Examples from the Corpus
man-to-man• So I strode up there to have this man-to-man chat with Nick.• man-to-man defense• Blue said the team is exciting to watch, in part, because they play man-to-man defense.• From what I could see Fairclough played as a form of sweeper with a man-to-man job in Wegerle.• It's always man-to-man stuff with them.• In 1959, at their man-to-man talks at Camp David, Eisenhower and Khrushchev admitted this to each other. 