ˈall-time BrE AmE adjective
used when you compare things to say that one of them is the best, worst etc that there has ever been
an all-time high/low
The price of wheat had reached an all-time low.
They reached an all-time record score.
ˈall-time BrE AmE adjective
used when you compare things to say that one of them is the best, worst etc that there has ever been
an all-time high/low
The price of wheat had reached an all-time low.
They reached an all-time record score.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012