be lost for words
idiomPart oflost
be lost for words — idiom
1. To be so surprised, shocked, or emotional that you cannot think of anything to s
1.idiom
Definition
To be so surprised, shocked, or emotional that you cannot think of anything to say.
Example
When Takeshi opened the gift and saw the watch his father had owned, he was lost for words.
The judge was lost for words when the defendant suddenly confessed to a crime nobody knew about.