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1. verb To place a covering on someone or something, as for protection. A noun or pronoun can be used between "cover" and "up." Let me just cover up these leftovers so you can take them with you. I'm so fair-skinned that I have to cover myself up before spending time in the sun.
2. To clothe oneself. I'll answer the door in a moment, I just need to cover up first.
3. verb To conceal the evidence of one's (usually nefarious) actions. A noun or pronoun can be used between "cover" and "up." I just know that the CEO is covering something up—why else would those documents suddenly go missing? The administration is clearly trying to cover up the scandal.
4. noun The act of concealing the evidence of nefarious actions. When used as a noun, the phrase is typically hyphenated or written as one word. Their cover-up unraveled when the CEO's secretary confessed to his wrongdoing. The administration is clearly engaging in a coverup to hide the scandal.
5. noun An article of clothing worn over other clothing, such as a bathing suit. When used as a noun, the phrase is typically hyphenated. Once it got breezy on the beach, I put my cover-up back on.
n. an act of concealing something. The candidate accused her opponent of a cover-up.