有口难言 find it difficult or embarrassing to bring up a matter
cannot bring oneself to mention something
- 告诉我你的想法--是否你有口难言?。
Can you tell what this is by feeling it? - 我何尝不想把我知道的都告诉你,只是有口难言。
I'd like to tell you what I know but my lips are sealed. - 楚使有口难言,只得空手回来报告楚王。这一来,可把怀王气昏了。
The envoy was forced to return home empty-handed, and King Huai realized he had been tricked.