In a secret, hidden, or stealthy way, especially to hide something illegal or improper.
From Middle French 'clandestin,' derived from Latin 'clandestinus,' combining 'clam' (secretly) and '-destinus,' ultimately meaning hidden or concealed.
During the American Civil War, the Underground Railroad operated clandestinely—the word perfectly captures how entire networks of people hid fugitive slaves in plain sight.
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