VERB
笨嘴拙舌地说话;结结巴巴地说话
When you are trying to say something, if you fumble for the right words, you speak in a clumsy and unclear way.
例句
I fumbled for something to say...
我磕磕巴巴地想说点儿什么。
He fumbled his lines, not knowing what he was going to say.
他因为不知道接下来要说什么而把台词给念砸了。