on the double

listen to the pronunciation of on the double
İngilizce - Türkçe
çok çabuk
(Askeri) KOŞAR ADIM: Bak. "double" ve "doubletime"
İngilizce - İngilizce
rapidly or immediately

Fortunately, help arrived on the double, and the victim's injuries were soon treated.

immediately, right now, at once
on the double