Terms for subject Jargon containing be on

English	Russian
be on a roll	попереть (кому-либо) начать крупно везти)
be on a roll	переть (=везти) в фразах типа "кому-либо прет/поперло" MariAlex)
be on about	нудеть (teterevaann)
be on drugs	наркоманить (igisheva)
be on its last legs	на ладан дышит (напр.: your battery life fading away quicker than it used to, I think your battery is on its last legs. Grebelnikov)
be on sentry-go	стоять на шухере (The nervous system was a bit below par, of course, but not nearly so much so as it might have been. Knowing that Bobbie would be on sentry-go made all the difference. Any gangster will tell you that the strain and anxiety of busting a safe are greatly diminished if you've a look-out man ready at any moment to say ‘Cheese it, the cops!' (P.G. Wodehouse) ART Vancouver)
be on sentry-go	стоять на стрёме (The nervous system was a bit below par, of course, but not nearly so much so as it might have been. Knowing that Bobbie would be on sentry-go made all the difference. Any gangster will tell you that the strain and anxiety of busting a safe are greatly diminished if you've a look-out man ready at any moment to say ‘Cheese it, the cops!' (P.G. Wodehouse) ART Vancouver)
be on the cell phone	говорить по мобильнику (MichaelBurov)
be on the cell phone	быть на мобиле (MichaelBurov)
be on the water waggon	дать зарок не пить
be on the water waggon	бросить пить
be slow on the draw	тормозить (туго соображать Andrey Truhachev)
be slow on the draw	тупить (Andrey Truhachev)
be slow on the uptake	тупить (Andrey Truhachev)
be slow on the uptake	тормозить (туго соображать Andrey Truhachev)