brush off

verb

To disregard (something), to dismiss or ignore (someone), as unimportant.
“Again I begged her to keep an eye on her blood pressure and not get so worked up, and once more she brushed me off, this time with a curt request that I would go and boil my head.”
“In a statement sent to the Guardian early on Friday, hours before Trump’s post was taken down, Karoline Leavitt, the White House press secretary, attempted to brush off the outrage.”
To depart with a sweeping motion; to rush away.
“Thus, ſeizing his hat, he bruſh’d off like the wind, / And the Porter and Eatables follow’d behind.”
Used other than figuratively or idiomatically: see brush, off. To remove something with a brush.