Bobbsey twins
[ bob-zee ]
/ ˈbɒb zi /
plural noun
two people who are often together or seem to resemble each other, as in appearance or actions: We called them the Bobbsey twins, because they always had the same opinions.
Origin of Bobbsey twins
from the central characters in a series of children's books by Laura Lee Hope, pen name of a literary syndicate; some of the books are attributed to U.S. author Lillian C. Garis (1873–1954)