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1. To cover something up with plaster or some other paste-like mixture. A noun or pronoun can be used between "plaster" and "over." We'll have to plaster over all these marks and holes in the wall before we move, or they might not give us our security deposit back. I hope they'll pay to plaster over the cracks in the ceiling.
2. To spread or smear plaster or some other paste-like mixture over something. A noun or pronoun can be used between "plaster" and "over." They plastered mud and excrement over the rival school's front doors. Mix up a bucket of whitewash and plaster it over the fence round back.
3. To fill, flood, or overwhelm some area of public discourse some kind of information. A noun or pronoun can be used between "plaster" and "over." Someone from his school started plastering rumors about him over social media. Details of the affair are being plastered over the news lately.
plaster over something
to cover over something with plaster. I think that we will just plaster over the cracks in the wall.