Thank you for the link. The dictionary is fantastic, not only as an excellent reference, but also as a place to browse at leisure. I pick a letter of alphabet, at random, and go through the entries, just for fun. Some sayings look familiar, many don't.
Today's letter is 'N', and I love the one: 'Not enough room to swing a cat'.
I have a comment on 'Not my cup of tea.' The explanation says if something is not your cup of tea it means that you don't like it very much. I'm pretty sure I've seen it in a context where it was clear that the meaning was 'beyond someone's scope of interest, activity or expertise.' May I ask what your opinion on this issue is?