The Collaborative International Dictionary
deaf and dumb \deaf and dumb\, deaf-and-dumb \deaf-and-dumb\adj. both deaf and unable to speak; without the sense of hearing or the faculty of speech. Same as Deaf-mute.
Wiktionary
a. Being deaf and not knowing how to speak. Usually physically able to speak. alt. Being deaf and not knowing how to speak. Usually physically able to speak. n. (context Cockney rhyming slang English) bum (behind, bottom).
Usage examples of "deaf and dumb".
She thought she had been struck deaf and dumb or had actually died.
First came the two slaves (deaf and dumb, as Aravis rightly guessed, and therefore used at the most secret councils) walking backwards and carrying the candles.
And the new cook, who was deaf and dumb, left off his stuffing of a calf's stomach and came over to make gobbling noises and flap his arms in gestures of protest or warning.
She had a relation, a niece I believe, living with her, a deaf and dumb girl of fifteen, or perhaps not more than fourteen.
Another little boy, who was deaf and dumb, was taken captive and carried by the Indians to their distant tribe, where he remained, adopted into the tribe, for about eighteen years.