sticking point
US /ˈstɪk.ɪŋ ˌpɔɪnt/
UK /ˈstɪk.ɪŋ ˌpɔɪnt/

1.
Knackpunkt, Streitpunkt
a point in a discussion or negotiation at which no further progress can be made because of a fundamental disagreement
:
•
The main sticking point in the negotiations was the budget.
Der Hauptknackpunkt in den Verhandlungen war das Budget.
•
We reached a sticking point on the terms of the contract.
Wir erreichten einen Knackpunkt bei den Vertragsbedingungen.