This is the 533rd most frequent Italian word.
neanche
"Neanche" means "not even" or "neither" in English.
In this sentence, 'neanche' is used to indicate something additional in a negative sense, meaning 'either' or 'not even'.
Non ho visto nessuno neanche oggi.
I haven't seen anyone today either.
Here, 'neanche' is utilized to express that a preceding negative statement also applies to another subject, meaning 'neither'.
Lui non vuole partecipare, e io neanche.
He doesn't want to participate, and neither do I.
In this case, 'neanche' intensifies the negative meaning of the sentence, implying 'not even'.