orillar
edge
orilla
edge, shore
+
-ar
verb suffix
Orillar means to edge and can be thought of as orilla0 (edge or shore0) + -ar1 (verb1), literally meaning 'to put an edge on' or 'to go along the edge'.
verb
- edgeTo move to or stay at the edge or border of something.El barco comenzó a orillar la costa para evitar las rocas. // The boat began to skirt the coast to avoid the rocks.