Welcome to English in a Minute from home.
A tone is a sound you hear in music or in someone's voice.
And deaf means unable to hear.
So what could tone deaf mean as an idiom?
Oh, Jonathan, Cynthia is so tone deaf.
She went to Duncan's party with peanut butter cookies and a big bag of peanuts.
What?
Duncan is allergic to nuts.
His party invitation said, please no nuts.
And she missed that completely.
