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English definition of “whopper”

whopper

noun [C]    /ˈhwɑp·ər, ˈwɑp-/ infml
something that is much bigger than the usual size: Your monthly payment is a whopper. A whopper is also a big lie: Fishermen are supposed to tell the biggest whoppers. whopping    /ˈhwɑp·ɪŋ, ˈwɑp-/ adjective infml The mayor was elected by a whopping majority.
(Definition of whopper noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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