Oberkante Unterlippe
When something is so near the end it’s like it's about to cry and say 'no more!'
That kid’s math skills were at Oberkante Unterlippe, one more problem and he was done.
The cake was at Oberkante Unterlippe, one more bite and it was a disaster.
His patience was at Oberkante Unterlippe, one more comment and he was yelling.