I .
( BrE also nanna ) / ˈnænə; NAmE / noun
( informal ) = nanny (2)
II .
/ ˈnɑːnə; NAmE / noun
( old-fashioned , BrE , informal ) a stupid person
SYN idiot :
I felt a right nana.
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WORD ORIGIN
I . mid 19th cent.: child's pronunciation of nanny or gran .
II . 1960s: perhaps a shortening of banana .