make nonsense of

make nonsense of something

to make something appear to be silly or nonsensical. You are just making nonsense of everything I have tried to do. Your statement makes nonsense of everything you have said before.
See also: make, nonsense, of

make nonsense (or a nonsense) of

reduce the value of something to a ridiculous degree.
See also: make, nonsense, of
References in periodicals archive ?
To describe the 47's achievements as a 'Militant Blight' compared to the wrecking policies of right-wing Labour and the Neo-Liberals is to make nonsense of the English language.