fore·short·en (fôr-shôr'tn, fōr-)
tr.v. fore·short·ened, fore·short·en·ing, fore·short·ens
1.To shorten the lines of (an object) in a drawing or other representation so as to produce an illusion of projection or extension in space.
2.To reduce the length of; curtail or abridge.
In other words, foreshortening is when you look at the end of something, like if the person in the drawing is pointing at you rather than having her hand down, you would have to forshorten her hand. You wouldn't see her whole hand, would you? You would have to draw it how it looks but it's harder than it sounds, or at least it is for me.
Happy drawing