| dupe | (verb) fool or hoax | Synonyms: befool, cod, fool, gull, put on, put one across, put one over, slang, take in |
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| duplex | (verb) change into a duplex | - |
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| duplicate | (verb) increase twofold | Synonyms: double |
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| (verb) make or do or perform again | Synonyms: double, reduplicate, repeat, replicate |
| (verb) make a duplicate or duplicates of | - |
| (verb) duplicate or match | Synonyms: parallel, twin |
| reduplicate | (verb) make or do or perform again | Synonyms: double, duplicate, repeat, replicate |
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| (verb) form by reduplication | Synonyms: geminate |