Past tense of 'dup,' meaning to open or to trick someone; to move quickly or nimbly.
From Middle English 'duppen,' possibly related to Old English 'dyppan' (to dip). The meaning shifted over time from physical actions (opening, dipping) to trickery through connection with 'dupe.'
English has so many archaic verbs like 'dupped' that we've completely forgotten—saying someone was 'dupped' (tricked) would be hilarious to someone in Elizabethan England but sounds totally made-up today!
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