The term 'LONG OAR' can be broken down into two crossword solutions: SCULL (5 letters) and SWEEP (5 letters). Sculling is a form of rowing where the rower uses two oars, one in each hand. This type of rowing is often used in racing and is considered to be more efficient than traditional rowing with one oar. SWEEP rowing is a type of rowing where each rower holds one oar and the boat is steered by a coxswain. This type of rowing is often used in team sports such as crew and is considered to be less efficient than sculling. Both types of rowing require a long oar, which is typically 8-10 feet in length.