take the reins

基本解释

to take the reins from Yukio Hatoyama, who resigned as prime minister Wednesday.
山由纪夫周三辞去日本首相职务后，副首相兼财务大臣菅直人(Naoto Kan)成了把握最大的接班人选。
He warned that Iraqi security forces may not be prepared to take the reins for at least another decade.
他警示保安部队可能还没有准备好在至少十年内掌管安全问题。
The three executives take the reins of an operation that has notched several successes, particularly in China, but faces a raft of challenges from the slowing economy.
上述三位高管接管的瑞银亚洲投资银行部门取得了数项成绩，在中国市场表现尤为出色，但同时也面临着经济放缓所带来的诸多挑战。

Yet there is nobody vetted and ready to take the reins of trade policy.
FORBES: Obama's Trade Policy Should Be Judged on Its Accomplishments, Not Its Promise
Take some initiative, take the reins, and be in charge of something that institutes a change.
FORBES: Nine Leadership Resolutions for the New Year
Today noted conductor James De Preist leaves for Japan to take the reins of that country's most celebrated orchestra.
NPR: Conductor James DePreist