keep the lid on (something)
1. To quash or suppress something; to control something so as to keep it from flourishing, increasing, or succeeding. We need to keep the lid on rumors about the company going bankrupt. We decided to keep the lid on the project as we didn't have enough funds to see it through to the end.
2. To not allow something to become known to other people; to keep something a secret or classified. No one else knows about it yet, so I'm keeping the lid on it for the time being. The company has so far kept the lid on details about its newest product.
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