not let grass grow under one's feet 不是不要让草在脚下生长

They've no let grass grow under their feet in hunting out the man that did it. 误译：他们没有让脚下长草就追捕了做这件事的人。 正确：他们说干就干，很快就把凶手抓到了。 说明：not let grass grow under one's feet 的意思是“说干就干；毫不迟疑；不浪费时间；不错过机会”。