The idiom "throw a wet blanket on" means to spoil or ruin someone's excitement or enthusiasm about something. It is used when someone says or does something that dampens the mood or enthusiasm of others.
For example, imagine you and your friends are planning a fun day out at the beach. One of your friends says, "I don't really feel like going to the beach. It's too hot and crowded." This comment might "throw a wet blanket on" the plans because it takes away the excitement and enthusiasm of the group.
Another example could be when someone is sharing good news, and another person responds with a negative comment or criticism. This can also "throw a wet blanket on" the good news and make the person feel less excited about it.
So, to summarize, "throw a wet blanket on" means to spoil or ruin someone's excitement or enthusiasm about something, and it is used when someone says or does something that takes away the positive energy of a situation.
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