step change 
noun
(In business or politics) a significant change in policy or attitude, especially one that results in an improvement or increase.There has been a step change in politics in this country since the war on Iraq, and the movement against it....
- The Commission says the Government's 10-year transport plan - published last year - offers ‘long awaited focus on integrated policies and a step change in levels of investment’.
- We look at companies that are looking to raise capital to fund a step change in their business.
- leathery
- leathery turtle
- leave
- leaved
- leave go
- leave hold of
- leave-in
- leave it at that
- leave its (or one's or a) mark
- leave/let well alone
- leave loading
- leave much (or a lot) to be desired
- leaven
- leavener
- leave no stone unturned
- Leavenworth
- leave of absence
- leave off
- leaver
- leaves
- leave school
- leave someone be
- leave someone cold
- leave someone/thing alone
- leave someone/thing in the dust