I give him an inch, and he takes a yard.
他太得寸进尺了。

这句话表示不知分寸，爱占便宜。也可说：“I gave him an inch, and he wanted to take a mile.”

如：Jerry keeps asking me for help. At first I helped because he was new here, but now... I give him an inch,and he takes a yard.
杰瑞总是让我帮忙。一开始我觉得他是刚到这儿的就帮了，可是现在……他太得寸进尺了。