sandwich board
US /ˈsændwɪtʃ bɔːrd/
UK /ˈsændwɪtʃ bɔːrd/
1.
a pair of boards with advertisements or notices on them, hinged together at the top and carried by a person, one board in front and one behind
:
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The protester wore a sandwich board with a political message.
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A man stood on the street corner, advertising a new restaurant with a sandwich board.