"kept on edge" is correct and usable in written English.
You can use it to express that someone is nervous, apprehensive, or tense about a situation. For example, "The team was kept on edge as they waited for the final score of the game".
Mix is kept on edge by his eccentric landlady, who also has an intriguing connection to Christie.
Since federal investigators revealed they were looking into the City Council's finances last year, the 51-member body has been kept on edge by the uneven pace of revelations: First came a tidal surge of news that the Council had for years used slush funds, stowed in the names of fictional organizations, to sidestep budget rules and bestow political favors.
Kuwait's civilian population, which has been host to more than 130,000 troops in its northern desert for months, was kept on edge by air raid sirens that began just after noon and continued to wail almost hourly until early this morning.
A10 NATIONAL A14-18 Families Kept on Edge By News of Deadly Crash At least five families in the towns outside Fort Campbell, Ky., lost a member in the helicopter crash in Iraq.
Fortunately, for us, our management educated us on how to study what's current without losing our integrity and to keep on edge while staying at the forefront of what's important right now".
Too much relaxation will result in a sluggish education, IB is the perfect opportunity to keep on edge for a better future.
This kept you on edge and kept your material sharp.
That seems to have been an effective way to keep the talent on edge.
There's always that concern, which keeps you prepared, keeps you on edge".
"It is a true, all-day adrenaline rush -- just enough to keep you on edge and keep you straight.
"We've always tried to make people think and keep them on edge and keep them wondering what's going on".
