begrudge can be broken into beg + rude... so some one who behave rudely with beggars ... the beggar 'wish ill ' for that person
be+grudge. when u have grudge on somebody u always wish ill for him
begru+dge--begru sounds like beggars. beggars usually wish ill to others as their own situation is bad.
be+grudge --recall Grudge the famous horror movie, in which the ghost ( of a lady) killed by her husband which later killed many others because of envy and grudge.
If you "be"come a "guru", others will be jealous of you and push you down from the e"dge" of a cliff.
begru+dge--begru sounds like begher , a begher (without house) person will always be envy of people who exiled him from his house.
REMEBER THE MOVIE GRUDGE where actor jim carrey portrays to be envy of santa...