be struck dumb

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be struck dumb

To be rendered speechless or dumbfounded, as due to a great surprise or shock. We were all struck dumb by my father's announcement that he was resigning from the company.
See also: dumb, struck

be struck ˈdumb (with something)

be suddenly unable to speak (because of shock, fear, etc.): We were struck dumb at the sight of three armed soldiers in the kitchen.The witnesses were struck dumb with terror. ▶ ˈdumbstruck adj.: When I found out that I had won first prize, I was dumbstruck.
See also: dumb, struck
References in periodicals archive ?
As for being STRUCK dumb, the cassette recorder was probably the first time many people had the opportunity of recording their own voices and discovering they sounded LIKE prats.