The term 'OAR PIN' is a combination of two words, 'OAR' and 'PIN'. An OAR is a long pole with a flat blade at one end, used to propel a boat through the water. A PIN is a small metal rod with a pointed end, used to fasten two or more pieces of material together. The crossword solution for this term is 'THOLE', which is a type of PIN used to secure an OAR in place on a boat. It is usually made of wood and has a hole in the center for the OAR to fit into.