This is the 1044th most frequent Japanese word.
史上
"史上" means "in history" or "historically."
Here, the word '史上' (shijou) means 'in history' or 'of all time,' specifying that the context of 'highest box office revenue' is within the scope of historical records or comparisons across history.
この映画は史上最高の興行収入を記録しました。
This movie achieved the highest box office revenue in history.
'史上' (shijou) again denotes 'in history' or 'historically,' emphasizing the unique and unprecedented nature of this event within human history.
史上初めて、人間が月に着陸した。
For the first time in history, humans landed on the moon.
In this sentence, '史上' (shijou) is used to denote that the scope of the comparison (being the worst president) spans all of recorded history for presidents.