Of an achievement, exceeding the highest previously recorded level in that activity.(adjective)
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Use "record-breaking" in a sentence
"His party took a vast surplus and turned it into a record-breaking deficit in part by giving tax breaks to the wealthy AFTER starting an unneeded, illegal and immoral war in Iraq and botching badly the questionable war on Afghanistan."
"And analysts think there's more record-breaking to come."
"Its shares rose 2.1% in Paris after its Airbus unit announced a record-breaking order for 180 aircraft from Indian budget carrier IndiGo."