Sandwich-board meaning

A pair of large placards, hinged at the top by straps for hanging over the shoulders with one board in front and the other behind, used for picketing or advertising.
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A pair of signboards fastened at their tops and separated at their bases to form a freestanding structure, as for sidewalk or roadside advertising.
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A pair of signboards hung, one in front and one behind, from the shoulders of a person paid to walk the streets displaying them.
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A person-sized, wearable billboard or advertisement consisting of two printed boards strung together so that they hang over the shoulders, thereby sandwiching the wearer.
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To advertise or campaign using a sandwich board; to wear a sandwich board.
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Origin of sandwich-board