What does pencil pushing mean?
Doing pointless, seemingly unessacary work. Usually used to describe someone that has been "de-moted" or "de-ranked".
If you are using a crayon or colored pencil, then that will be the easiest way to make the color tan. First, get a normal colored brown crayon or colored pencil. Then, start coloring very lightly with a brown crayon or colored pencil on a paper. Make sure you are not pushing down hard on the pencil, because then you will get dark brown, not tan. If you are following the instructions correctly, then you…
If you are referring to the phrase "To serve a purpose" then it would mean to give a use for. For example, A pencil holder cup serves a purpose to a pencil... the pencil give the holder purpose and that purpose is to hold the pencil. Basically it means, that something has a use... there is a reason/intended use for this thing.