혀를 내둘러요 · 혀를 내둘렀어요 (르 irregular)
to be amazed; to marvel
Example
그 아이의 피아노 실력에 모두가 혀를 내둘렀어요.
Everyone was amazed by the child's piano skills.
Word parts
Literally 'to swing one's tongue around' — left speechless in amazement.
Good to know
Don't confuse with 혀를 차다 'to click one's tongue in disapproval.'