historic high
noun[C]
FINANCEukus(alsohistorical high)thehighestlevelthat something, such as apriceorinterestrate, has been at anytime:
hit/reached a historic highHomeassessmentshithistorichighsthisyeardespitedecliningmarketvalues.
Profits, as ashareofnationalincome, areat ahistorichigh.