English ⇄ Russian

a shot across the bow stresses
amer.	предостережение (от необдуманных действий; The lawsuit is a shot across the bow to businesses that they are competing unfairly. Val_Ships)
idiom.	первый звоночек (Оли Гогелиа)
a shot across the bows
idiom.	предупредительный выстрел (Баян)