Rur. ridiculously easy. Jane's a good mechanic. Changing a tire is like shooting fish in a barrel, for her.That comedian has an easy job. Making fun of politicians is like shooting fish in a barrel.
Ridiculously easy, as in Setting up a computer nowadays is like shooting fish in a barrel. This hyperbolic expression alludes to the fact that fish make an easy target inside a barrel (as opposed to swimming freely in the sea). [Early 1900s]