The term 'A DARK GREY CLOUD BEARING RAIN' can be broken down into five crossword solutions: NIMBI (5 letters), NIMBUS (6 letters), STRATUS (7 letters), ASH (3 letters), and DUN (3 letters). NIMBI is a Latin word meaning 'rain-bearing cloud'. NIMBUS is a type of cloud that is dark grey and produces rain. STRATUS is a type of low-level cloud that is usually grey or white in color. ASH is a type of cloud that is dark grey and often associated with rain. DUN is a dark grey color. All of these words describe a dark grey cloud bearing rain.