On the up

British: 
improving, getting better, improved, enhanced, on the up and up, it makes a change

American: 
honest and not trying to trick anyone, honest, sincere, fine, genuine, decent, truthful, principled, irreproachable, good, upstanding.

• My sister has just got a new job. The company has given her a house and a car as part of the deal – things are on the up for her! - vont de mieux en mieux
• The economy is on the up now that the new government is in power. They've already helped to create thousands of new jobs
• a fine, upstanding young man- droit, honnête

Source TEW: http://www.bbc.co.uk/worldservice/learningenglish/language/theenglishwespeak/2013/04/130423_tews_120_on_the_up.shtml