block out
1．mark out in blocks标示街区
The area has been blocked out，and building will begin soon．这个地区的建筑图纸已经画好，不久就要施工。
2．stop from getting through阻止通过
That wall blocks out all the light．那堵墙挡住全部光线。
3．stretch out roughly without details；plan画出…的草图；写出…提纲
He's blocked out an outline for his essay．他已经写好了论文提纲。