Etymology
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Big Dipper (n.)

American English name for the seven-star asterism (known in England as the plough; see Charles's Wain) in the constellation Ursa Major, 1845; attested 1833 as simply the Dipper (sometimes Great Dipper, its companion constellation always being the Little Dipper). See dipper.

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Definitions of Big Dipper
1
big dipper (n.)
elevated railway in an amusement park (usually with sharp curves and steep inclines);
Synonyms: roller coaster / chute-the-chute
2
Big Dipper (n.)
a group of seven bright stars in the constellation Ursa Major;
From wordnet.princeton.edu