The Spanish verb 'apañar' (meaning 'to mend' or 'to arrange') has its roots in the Latin word 'pannus', which meant 'cloth' or 'fabric'. This evolved into the Spanish noun 'paño' (meaning 'cloth'), and then was transformed into a verb by adding the prefix 'a-' and the verbal suffix '-ar'. The development of meaning from 'cloth' to 'to mend/arrange' likely came from the common activity of mending or arranging cloth and fabrics, which then generalized to fixing or arranging things in general.

A simpler related Spanish word is 'paño' (cloth), which is directly derived from the Latin 'pannus'. While 'paño' retained the original meaning of 'cloth' or 'fabric', its derivative 'apañar' expanded to mean fixing or arranging things in general, not just cloth. You might also encounter 'pañuelo' (handkerchief), which is a diminutive form of 'paño'.

While English doesn't have many common direct cognates from Latin 'pannus', we do have some specialized terms like 'panel' (originally a piece of cloth or parchment) and 'pane' (as in window pane), which come from the same Latin root. The word 'pannus' also gives us medical terms like 'pannus' (abnormal tissue growth) and 'panniculitis' (inflammation of fatty tissue).