There exist certain fixed expressions which people use to convey quite specific meanings and (at least to me) always invoke a famous saying which is assumed to be common knowledge, such as
- I am not a crook (AFAIK primarily American English), denoting that the speaker has done something dubious
- I have a cunning plan (AFAIK primarily British English), denoting the proposition of an absurd/risky/generally bad idea
However, it seems to me that these phrases are not typical idioms because their meaning is at least partly compositional, unlike e.g. kick the bucket: Nevertheless, they invoke a more nuanced meaning than the composition of the words themselves implies, and there even seems to be some contrast between these expressions and a pure generative usage of the above phrases:
- I'm not a crook! → The speaker is not a crook (unmarked meaning)
- (said in a stilted voice) I am not a crook. → The speaker has done something dubious
Is there any terminology commonly used for describing this specific phenomenon?