man ‧ o a man ‧ o /ˌmænəʊ ɑː ˈmænəʊ $ ˌmɑːnoʊ ɑː ˈmɑːnoʊ/ BrE AmE adverb
with only two people involved SYN one-to-one :
He finally faced up to his father, mano a mano, telling him he was going to leave college.
man ‧ o a man ‧ o /ˌmænəʊ ɑː ˈmænəʊ $ ˌmɑːnoʊ ɑː ˈmɑːnoʊ/ BrE AmE adverb
with only two people involved SYN one-to-one :
He finally faced up to his father, mano a mano, telling him he was going to leave college.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012