Christina McGown (asker) Jul 2, 2015:

Hi Nikki. Thank you very much for your answer. I found lower and upper slotting at first, but they didn't quite fit in meaning of the sentence and in the end I went for under and over after finding Kashew's link. Thank you also for your guidelines. I appreciate this.

Nikki Scott-Despaigne Jun 29, 2015:

I have done a few brief searches. I came across EN sources with "lower/upper slotting", rather than "under/over". Have you tried these terms for your context? Actually, it wld be helpful to say which pair of terms you have considered and rejected and why, essentially to avoid us feeding back terms you have already excluded. Also, even if you have excluded them, it is possible that someone cld in fact confirm that terms you are rejecting are in fact appropriate. So, always a good idea to indicate your ideas, even if cast aside. ;-)