The difference between Man-to-man and One-on-one
When used as adjectives, man-to-man means direct, forthright and honest, whereas one-on-one means involving direct communication between two people.
Man-to-man is also adverb with the meaning: directly, forthrightly and honestly.
One-on-one is also noun with the meaning: a contest involving only one player on each side, especially of an activity often involving teams.
check bellow for the other definitions of Man-to-man and One-on-one
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Man-to-man as an adjective:
direct, forthright and honest
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Man-to-man as an adjective (sports):
one-on-one
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Man-to-man as an adverb:
directly, forthrightly and honestly
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One-on-one as an adjective (chiefly, North America):
Involving direct communication between two people.
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One-on-one as an adjective (sports):
involving one attacker and one defender
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One-on-one as an adjective (mathematics):
bijective or injective
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One-on-one as a noun:
A contest involving only one player on each side, especially of an activity often involving teams.
Examples:
"Why don't we play a little one-on-one until the others show up."
"He was willing to go one-on-one with the District Attorney himself."