Overmoisten

The technologist must be careful not to overmoisten the disk, as false negative results can occur due to dilution of the end product.

Source: wiktionary

Sweet alyssum seedlings are particularly prone to damping off, so do not overmoisten the soil.

Source: wiktionary

If the mixture is too dry to incorporate all the flour, a bit at a time, stir in just enough more ice water to blend the ingredients; don't overmoisten, as the dough should be stiff.

Source: wiktionary