말문이 막힐 정도로 깜짝 놀라게 하거나 어안이 벙벙하게 만들다.
To strike someone with great surprise or astonishment, often leaving them temporarily unable to speak.
예문:
"The unexpected twist at the end of the movie dumbfounded the critics who had predicted a cliché ending."
"She was completely dumbfounded when her boss offered her a promotion and a massive bonus."
"The sheer scale of the ancient ruins dumbfounded the archaeologists upon their discovery."