be too shy to speak out;have a bone in the throat;hard to speak out;too embarrassed to mention sth. ;

I let them fire away. I taught them to ask still more ticklish questions.
我让他们不停地问, 我教他们提出更难以启齿的问题.
来源:互联网摘选I was so overpowered by my guilt and my shame that I was unable to speak.
内疚和羞愧令我无地自容,难以启齿。
来源:《柯林斯高阶英汉双解学习词典》
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