The term 'MINE SLOPE' is composed of two words: 'MINE' and 'SLOPE'. The first word, 'MINE', is a noun that refers to a deep hole or tunnel in the ground from which minerals or coal are extracted. The second word, 'SLOPE', is a noun that refers to an inclined surface or a gradient of a line or surface. Together, the term 'MINE SLOPE' refers to a sloping tunnel or shaft dug into the ground for the purpose of mining. The crossword solution for this term is 'ADIT', which is a noun that refers to an entrance or passage into a MINE.