Do well and have well.善有善报。

Do well is better than say well.说得好不如做得好.

Dog does not eat dog.物不伤其类.

Dogs that bark at a distance bite not at hand.远处叫得凶的狗，不会近身来咬人.

Dogs that run after many hares kill none.多谋寡成.

Dogs wag their tails not so much in love to you as your bread.狗摇尾巴，爱的是面包.

Doing is better than saying.行胜于言.

Don’t carry coals to Newcastle.别往纽卡斯尔（英国煤都）运煤。/ 多此一举，徒劳无益。

"Don’t meet trouble half-way.

"不要杞人忧天。

Don’t trouble troubles till trouble troubles you.麻烦未来找你，别去自找麻烦。

Don't carry coals to Newcastle.别往纽卡斯尔（英国煤都）运煤。/ 多此一举，徒劳无益。

Don't cast out the foul¹ water till you bring in the clean.清水未来，莫泼赃水.

Don't claim to know what you don't know.不要不懂装懂。

Don't cross the bridge till you get to it.不要杞人忧天.

Don't fly till you wings are feathered.羽毛未丰不要飞.

Don't halloo till you are out of the wood.没有脱离危险不要先欢呼.

Don't have thy cloak to make when it begins to rain.切莫临时抱佛脚.

Don't have too many irons in the fire.不要揽事过多。

Don't make a mountain out of a molehill.不要小题大做。

Don't meet trouble half-way. 勿杞人忧天。

Don't play games with me!别跟我耍花招!

Don't put all your eggs in one basket. 勿孤注一掷。

Don't put off till tomorrow what should be done today.今日事，今日毕.

Don't put the cart before the horse.不要本末倒置。

Don't ride the high horse. 勿摆架子。