This word is a combination of 縁 (edge) and 取る (to take). Picture yourself taking the edge of an object and giving it special attention: you're taking that edge in order to add a border to it or to decorate the edges of it.

This can apply to the edges of all sorts of things, like adding a white border to a photograph (写真を白い枠で縁取る), decorating the edges of a handkerchief with lace (ハンカチをレースで縁取る), or even lining one's eyes with eyeliner (目をアイライナーで縁取る). It can also be used to describe how something happens to form a border around something, like trees around a lake (木々が湖を縁取る).

This is a combination of the kun'yomi words 縁 (ふち) and 取る (とる), which you've already learned, so you should be able to read this one. Just make sure you remember that とる becomes どる because of rendaku.