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The person is in a moving train. He/she is sitting on a suitcase. He/she is on his/her way to a meeting. The meeting is important, and he/she has been waiting for it for two decades, i.e. 20 years.
The person is in a moving train. He/she is sitting on a suitcase. He/she is on his/her way to a meeting. The meeting is important, and he/she has been waiting for it for two decades, i.e. 20 years.
Why is she/he sitting on a suitcase?
Does it mean (the train was housefull and she couldn't get place to sit on)?
Does it mean (the train was housefull and she couldn't get place to sit on)?
Yes, I think that's a fair assumption.
He could also be sitting on his suitcase to make sure nobody steals it. This would be quite possible if he's going to a very important meeting. Maybe there's something equally important in the suitcase.
Hard to say with no context.
AFAK, "sitting on a suitcase" isn't an idiom or expression.
please rephrase the sentence 
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