Hi Raymott,
Thank you for your response.
I'm sorry I failed to make myself clear.
For instance, the word of 'crappy' is vulgar to some people. 'crappy' is related to excretion and comparable to sh*t.
But Cambridge Dictionaries Online doesn't explain that but simply said it is unpleasant, offensive.
Cambridge Dictionaries Online - Cambridge University Press
I hope teachers or forumites could tell me 'crappy' is related to excretion and comparable to sh*t, this is what I referred to literal meaning, so that I could really understand why it is bad and offensive.
In such a case, how should I make myself clear in English if I don't use 'literal meaning'?
Could you please suggest? Thanks in advance.
PS: I've understood the meaning of 'crappy'.