Here are some ways to understand it:
* Literally: Imagine a pot boiling over. Putting a lid on it stops the contents from spilling out.
* Figuratively: The expression uses the lid as a metaphor for a barrier or control mechanism. It suggests stopping something that's out of control or causing problems.
Here are some examples of how the expression is used:
* "I need you to put a lid on your complaining. It's getting annoying." (meaning: Stop complaining)
* "The new regulations should help put a lid on illegal activities." (meaning: Stop illegal activities)
* "Please put a lid on the music. The neighbors are complaining." (meaning: Turn the music down)
Other similar expressions:
* "Cut it out"
* "Stop it"
* "Enough is enough"
* "Keep it down"
The expression "put a lid on it" is generally used in a casual or informal setting.