verb. to duck1. a quick lowering of the head (to avoid a blow or so as not to be seen)2. depart quickly3. avoidnoun. wild duck (more commonly known as mallard duck or anas platyrhynchos) - an undomesticated duck.note. Due to its beautiful feathers, the mallard duck is one of the most popular ducks for hunters. When injured or threatened, ducks have been alleged to commit suicide, by diving to the bottom of the water, never returning to the surface. Almeida Associate Director Robert Icke stages a new version of The Wild Duck, Ibsen's masterpiece about the nature of truth.