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third-person singular simple present overthickens, present participle overthickening, simple past and past participle overthickened
(transitive) To thicken to an excessive degree. quotations examples
But it depends on the strength of the slurry or beurre manié, so thicken gradually, keeping in mind that you can always make the sauce thicker, but if you overthicken it, you will be forced to dilute it in order to thin it.
2015, Michael Ruhlman, Ruhlman's How to Braise: Foolproof Techniques and Recipes for the Home Cook