adjective [原级]哑的，不能说话的；一时说不出话的，不肯开口的；<非正式>愚蠢的；（计算机终端）简易的
We were all struck dumb for a minute.
我们一时个个都哑口无言。
verb [vt. 及物动词]使通俗化；<文>使变哑，使沉默
That was a pretty dumb thing to do.
做那样的事太愚蠢了。
“当” → 羞愧难当， 哑口无言 → 哑的
单词造句:
We were all struck dumb for a minute.
我们一时个个都哑口无言。
That was a pretty dumb thing to do.
做那样的事太愚蠢了。