Culinary definition for dust: To coat very lightly with flour or confectioner's sugar.
C@H FOOD FOR THOUGHT
Dusting is lightweight compared to dredging and generally involves a small sieve or shaker, rather than a dredging bag or bowl.
Twirling a teaspoon around in a fine sieve filled with a few tablespoons of confectioners sugar or flour, generally does the trick - as it did over these beautifully dusted madeleines (right).