The term 'OAR FULCRUM' is a combination of two words, 'OAR' and 'FULCRUM'. An OAR is a long pole with a flat blade at one end, used to propel a boat through the water. A FULCRUM is a point or support on which a lever rests or is supported in order to move a load. Together, an OAR FULCRUM is a point on an OAR where the force is applied to move the boat. The crossword solution for this term is 'THOLE', which is a pin or peg in the gunwale of a boat that an OAR is placed in to provide leverage when rowing.