overbeat

over- +‎ beat

overbeat (third-person singular simple present overbeats, present participle overbeating, simple past overbeat, past participle overbeaten)

1. (transitive) To beat (eggs, cream, etc.) for too long, impairing the texture.
   • 2008 January 16, “Recipe: Whole-Grain Pancakes”, in New York Times‎:

     Beat egg whites with an electric mixer or a whisk until stiff peaks form, but do not overbeat.