What does idiom lost for words mean?

The idiom "lost for words" means unable to speak, usually because of surprise, shock, or strong emotion. It suggests that someone is so overwhelmed that they can't find the words to express themselves.

Here are some examples of how it might be used:

* "I was completely lost for words when I saw the beautiful view from the mountaintop."

* "The news of her sudden death left me lost for words."

* "He was so surprised by her confession that he was lost for words."

Essentially, it's a way to describe the feeling of being speechless due to a strong emotion or unexpected situation.