Synonyms of 'placard'
The marchers sang and waved placards.
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An advertisement is an announcement in a newspaper, on television, or on a poster about something such as a product, event, or job.
She recently placed an advertisement in the local paper.
A sign forbids the posting of bills.
Thesaurus for placard from the Collins English Thesaurus
A placard is a large notice that is carried in a march or displayed in a public place.