duh /ˈdʌ/ usually with a prolonged vowel interjection /ˈdʌ/ usually with a prolonged vowel
interjection
Learner's definition of DUH
US, informal
1
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used in an angry or annoyed way to show that something just said is already known or is obvious（气愤或懊恼地表示当然）咄，哧 -
“It sure is dark out.” “Duh, it's the middle of the night.”“外面肯定是漆黑一片。”“哧，现在是半夜。”
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“You have to turn the key to start the car.” “Well, duh.” [=I know that]“你必须拧钥匙才能发动车辆。”“咄，我当然知道。”
2
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used to show or pretend that you do not know something（表示或假装不知某事）哦