We had several customer leads that all turned out to be dead ends.
»It's very demoralizing for her; she perceives that her career is at a dead end.
reach/hit a dead end »Plans to build a new toll road have reached a dead end.
Англо-русский строительный словарь. — М.: Русский Язык.С.Н.Корчемкина, С.К.Кашкина, С.В.Курбатова.1995.
Остаточний кінець
зупинка без можливості повторного запуску