amarrar
tie
moor
to secure (a boat) with ropes or anchors
+
-ar
verb suffix
Amarrar means to tie and can be related to the English word moor0 (to secure a boat with ropes0) + -ar1 (verb suffix1).
verb
  1. tie
    To tie or fasten something with a rope or cord
    Necesito amarrar el bote al muelle. // I need to tie the boat to the dock.