One who dups; a person who opens, tricks, or moves quickly.
Agent noun formed from 'dup' plus the suffix '-er.' Follows the standard English pattern of turning verbs into nouns by adding '-er' to indicate someone who performs the action.
The suffix '-er' has been used for over a thousand years to turn actions into people (a person who bakes is a baker), which is why English has infinite potential words—you can theoretically make any verb into a person!
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