"maintain initiative" is correct and usable in written English.
It can be used to refer to the willingness to continue an activity, follow a plan, or move forward with a task, despite any difficulties or obstacles. For example, "Despite the challenging economic climate, she was determined to maintain initiative and keep her business afloat."
He is also expected to maintain initiatives to keep mortgage costs low, especially the funding for lending scheme credited with boosting demand among first-time buyers.
Furthermore, greater thought needs to be given to maintaining initiatives – nets get torn, supplies run out and, unless updated, community leaders give out-of-date advice.
Under the Pentagon strategy, the American military, not Al Qaeda or the Taliban, will maintain the initiative.
It remains to be seen whether his replacement, Tracey Crouch, will maintain the initiative.
Unilateralism was Sharon's response to the need to act, maintain the initiative and keep creating facts on the ground.
By alternating tactics, he went on, Hezbollah was able to maintain the initiative and, after a clash, melt away into a largely sympathetic populace.
We didn't close off the back-side mountain exit, we didn't maintain the initiative, and we allowed Al Qaeda to disperse".
However, Bragg was unable or unwilling to maintain the initiative, and as the Federal force began to receive reinforcements he ordered his army to retreat back into Tennessee, above the protests of some of his lieutenants.
Afghan forces are to assume the lead role for the war next year, and a military officer said that such a troop level would enable the United States to better support them, maintain the initiative and control critical terrain.
In 1992, the then Conservative Scottish secretary, Ian Lang, argued that publishing tax and spending figures for Scotland was "just what is needed at present in our campaign to maintain the initiative and undermine the other parties".
