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Từ điển Oxford Advanced Learner 8th
don't-know
ˌdon't-ˈknow 7 [don't-know] BrE NAmE noun
a person who does not have a strong opinion about a question which they are asked in an ↑opinion poll
•A quarter of all the people surveyed were don't-knows.
•Put me down as a don't-know.
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