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dumb bomb
dumb cane
dumb down
dumb luck
dumb show
dumb terminal
Dumbarton
dumbbell
dumbfound
DUMBO
dumbo
dumbstruck
dumbwaiter
dumdum bullet
dumfound
Dumfriesshire
dummel-headed
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dumbfound

dumb·found [ dùm fównd, dúm fòwnd ] (past and past participle dumb·found·ed, present participle dumb·found·ing, 3rd person present singular dumb·founds) or dum·found [ dùm fównd, dúm fòwnd ] (past and past participle dum·found·ed, present participle dum·found·ing, 3rd person present singular dum·founds)


transitive and intransitive verb 
Definition:
 
make somebody speechless: to make somebody temporarily speechless with astonishment

[Mid-17th century. <dumb + confound]
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