использовать благоприятную возможность The secret of his success as a businessman is that, he always knows when he's onto a good thing.
BE ONTO A GOOD THING
Англо-русский перевод BE ONTO A GOOD THING
English-Russian Muller's dictionary 24 edition. Англо-Русский словарь Мюллера 24 редакция. 2012