VERB
笨嘴拙舌地說話;結結巴巴地說話
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...
我磕磕巴巴地想說點兒什么。
He fumbled his lines, not knowing what he was going to say.
他因為不知道接下來要說什么而把臺詞給念砸了。