high-water mark

They racked up some electoral wins, and at their high-water mark received 7.1% of the vote in 1989 European Parliament elections in West Germany.

If Hillquit’s mayoral campaign was close to a high-water mark for official American socialism, it was also the beginning of the end.

They've come to see that moment of celebration after the inquests as their high-water mark.

Trump's discredited audio-visual presentation of what he said was the systematic extermination of white Afrikaner farmers was the high-water mark of their lobbying efforts, amplified as they were in the Oval Office.

It remains for me the high-water mark of Beckett acting.