1º_ Nutritive liquid, white, secreted by female mammals to feed their young. It is also marketed as a beverage and part of the preparation of other foods for humans, and is extracted from animals (especially cows) for that purpose. 2º_ By association with the previous one, any whitish liquid, such as the juice of the fruits or seeds of some plants. 3rd_ Blow . 4º_ Luck, something good. See bad milk, have milk, jar.