The poet's thoughts while working with his neighbour to mend the dry stone wall between their land. It's unlikely that Frost intended any deeper meaning, but you can read a social message into it if you like.
Terse Verse:
Never leave your walls unmended,
for the neighbours get offended.
Build em six feet high and stout,
its best to keep the bastards out.
...Steph#2 (I only know the nick)
آی-ویدئو