Overbeating
Overbeating refers to the excessive agitation or mixing of a substance, often in culinary or chemical contexts. In baking, overbeating can lead to a tough texture, particularly in products relying on gluten development, such as cakes and muffins. When flour is mixed with liquid, gluten strands begin to form. Continued and vigorous mixing can cause these strands to become too numerous and tightly bound, resulting in a dense and chewy outcome rather than a tender one. For some recipes, like certain breads where significant gluten development is desired, a degree of overbeating is acceptable or even beneficial, but it is a fine line.
In the context of emulsions, such as mayonnaise or sauces, overbeating can cause the mixture to break.