1.汗马功劳 distinctions won in battle, one's contribution in work
During the bilateral trade negotiations, he spared neither day nor night to make them a success. His contribution was indeed great and is highly appreciated.
2.悬崖勒马 pull back before it's too late
In spite of having done wrong, you can still pull back now before it is too late and work for a bright future.
3.一马当先 be the first, take the lead
When we were climbing the mountain, he took the lead and made for the summit.
4.单枪匹马 do something single-handedly
Xiao Song, the center forward, takes the ball single-handedly into the rival's court, dodges all obstacles and shoots, he always manages to score nine times out of ten.
5.老马识途 an old hand is the best guide, an old horse knows the way
The road is rugged and winding, so we have Lao Zhang lead the way because an old hand is the best guide.
6.马到成功 win instant/speedy success
If the problem is given to this research institute, which is well-equipped and well-staffed, we believe it can be both successfully and quickly done.
7.秣马厉兵 be combat-ready, (feed the horses and sharpen the weapons) make active preparations for war
The two teams will play in the finals tomorrow. Both sides are combat-ready and hoping to do well.
8.走马观花 give a hurried and cursory glance at, cast only a passing glance at
Having business at hand, he only had a passing glance at Sanya.
9.天马行空 an unrestrained and vigorous style of imagination (that brims with talent)
Give your child a piece of blank paper, and he will show you an unrestrained imagination.
10.塞翁失马 a blessing in disguise, a loss may turn out to be a gain
The failure of the summit may be a blessing in disguise.