The act or practice of cheating or swindling someone; a scheme or trick used to defraud.
From condiddle plus the noun-forming suffix -ment, which transforms verbs into abstract nouns describing actions or states. Common pattern in English word formation.
The -ment suffix is English's favorite way to turn verbs into fancy nouns—compare 'judge' to 'judgment' or 'move' to 'movement'—and it turns the simple 'condiddle' into something that sounds like an elaborate con.
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