Springtime is a time of renewal and growth . Many plants end their long winter sleep and form new buds and shoots . And the grass will grow thicker and greener again . Some flowers bloom in a very noticeable way but that is not the case with grass . Imagine you are sitting in a grassy field . And you have only one job – to watch the grass grow . That does not sound very interesting . In fact , it sounds really boring . That idea is what gives us the expression “like watching grass grow .” We use this expression to describe an experience that is uninteresting . Another good word to describe it is tedious . We use this expression in many situations . Let's hear a few examples : After the politician won his campaign , he gave a two-hour long acceptance speech . It was as much fun as watching grass grow . I really don't like watching long sports games . It's like watching grass grow . Now , grass grows on the ground all the time . And usually , we don't give it much thought . If you stand in one place for a long time , the grass will continue to grow under your feet . For people who are always active , always moving , always on-the-go , we can say they don't let grass grow under their feet . We can also say beneath their feet . And sometimes we use this expression as a command . Let's hear some examples : Don't let the grass grow beneath your feet . Get back to work . She certainly doesn't let the grass grow under her feet . She's been traveling non-stop for over a year .