be lost for words
US /bi lɔst fɔr wɜrdz/
UK /bi lɔst fɔr wɜrdz/

1.
說不出話來, 無言以對
to be so surprised, confused, or emotional that you cannot think of anything to say
:
•
When she saw the surprise party, she was completely lost for words.
當她看到驚喜派對時,她完全說不出話來。
•
His rude comment left me lost for words.
他粗魯的評論讓我說不出話來。