expression, ichidan verb
to strike dumb with astonishment; to leave speechless
Literary and emphatic expression. Used when someone is so amazed or shocked that they are rendered speechless. Often appears in written narratives.
その光景は見る者を瞠若たらしめた。
The sight struck the onlookers dumb with astonishment.
彼の突然の告白に、一
His sudden confession left everyone speechless.