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N-COUNT
（容器的）盖，盖子
A lid is the top of a box or other container which can be removed or raised when you want to open the container.
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N-COUNT
眼睑；眼皮
Your lids are the pieces of skin which cover your eyes when you close them.
例句
A dull pain began to throb behind his lids.
他的眼皮后面开始隐隐作痛地抽动。
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N-SING
限制；抑制；隐瞒
If you say that someone is keeping the lid on an activity or a piece of information, you mean that they are restricting the activity or are keeping the information secret.
例句
The soldiers' presence seemed to keep a lid on the violence...
士兵的存在似乎抑制住了暴力活动。
Their finance ministry is still trying to put a lid on the long-simmering securities scandal.
他们的财政部仍在试图遮掩一触即发的证券丑闻。
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N-SING
（对开支的）控制，封顶
If you say that you want to keep a lid on the cost of doing something, you mean that you want to prevent it costing you more than you feel is reasonable.
例句
If our industry is to remain competitive it must mean keeping a lid on prices.
我们的行业要想保持竞争力，就必须对价格加以控制。