张口结舌,目瞪口呆,垂头丧气
sb's jaw dropped / fell / sagged
(突然吃惊或失望得)张口结舌,目瞪口呆,垂头丧气
used to say that sb suddenly looked surprised, shocked or disappointed
释义来自《牛津高阶英汉双解词典》第 9 版