Fetching details from the dictionary...

roughly; approximately; round about; more or less
cursorily; briefly; quickly; lightly; roughly
ざっと計算すると百万円になる。
Roughly calculated, it comes to one million yen.
時間がないので報告書をざっと読んでみた。
I skimmed through the report.
ざっと見て問題がないか確認した。
I roughly checked if there were problems.