The term 'lowest level' can be expressed in a variety of ways. The five solutions to the crossword are 'DREGS' (5 letters), 'CELLAR' (6 letters), 'alltimelow' (10 letters), 'bottomrung' (10 letters), and 'rockbottom' (10 letters). DREGS refer to the sediment at the bottom of a liquid, while a CELLAR is an underground room or storage area. Alltimelow, bottomrung, and rockbottom are all idioms that refer to the lowest point or level of something.