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

1.
terdiam, kehilangan kata-kata
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.
Apabila dia melihat parti kejutan itu, dia benar-benar terdiam.
•
His rude comment left me lost for words.
Komen kasarnya membuat saya terdiam.