French prepositions are words that are used to link nouns, pronouns, and phrases to other words within a sentence. The four French prepositions given in the crossword solutions are 'SANS, ' 'entre, ' 'AVEC, ' and 'des.' 'SANS' is a preposition meaning 'WITHOUT, ' 'entre' is a preposition meaning 'BETWEEN, ' 'AVEC' is a preposition meaning 'WITH, ' and 'des' is a preposition meaning 'of the.' These prepositions are used to indicate relationships BETWEEN different parts of a sentence.