hedge;  fence;  border;  limit
 stone wall;  natural stone wall
 to put up an (emotional) wall (between two people);  to become distant;  to form a wall (of people)
 gap (in a fence or hedge);  chink;  opening
 to quarrel among friends (or siblings)
 to quarrel among friends (or siblings)
 springtime repairing of fences after winter damage