What Does It Mean?

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From our dictionary:
ma•no a ma•no

(Sp. mä'nô ä mä'nô; Eng. mä'nO u mä'nO)
1. (italics) Spanish. a corrida in which two matadors alternate in fighting two or three bulls each.
2. a direct confrontation or conflict; head-on competition; duel.
3. being or resembling such a confrontation: a mano a mano struggle in the courtroom between two superb criminal lawyers.
4. in direct competition or rivalry: a brash newcomer in tennis taking on the reigning champion mano a mano.