/ ˌmɑːnəʊ æ ˈmɑːnəʊ; NAmE ˌmɑ:noʊ ɑ: ˈmɑ:noʊ/ adverb , noun
( informal , especially NAmE , from Spanish )
■ adverb
with two people facing each other directly in order to decide an argument or a competition :
It's time to settle this mano-a-mano.
■ noun
( pl. mano-a-manos ) a fight or contest, especially one between two people
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WORD ORIGIN
Spanish , literally hand-to-hand .