It means goodbye (2-2)
I believe the answer is:
ta-ta
This might be a double definition.
'it' is the first definition.
The definition suggests a singular noun which matches the answer.
'goodbye' is the second definition.
(I've seen this before)
'means' acts as a link.
Can you help me to learn more?
(Other definitions for ta-ta that I've seen before include "Adieu" , "Bye!" , "A Farewell" , "Bye-bye" , "Cheerio" .)