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grandad (n.)
[grandad 词源字典]
also
granddad
, 1793, from
grand-
+
dad
.
Grand dada
attested from 1690s.
Grandaddy
is attested from 1751; figuratively (in
grandaddy of all _____
) from 1898.
[grandad etymology, grandad origin, 英语词源]
[grandad 词源字典]