clean slate

: free from dirt or pollution

: free from contamination or disease

: free or relatively free from radioactivity

: so as to clean

: in a clean manner

: all the way : completely

: to make clean: such as

: to rid of dirt, impurities, or extraneous matter

: to rid of corruption

: an act of cleaning dirt especially from the surface of something

: a piece of construction material (such as laminated rock) prepared as a shingle for roofing and siding

: a dense fine-grained metamorphic rock produced by the compression of various sediments (such as clay or shale) so as to develop a characteristic cleavage

: a tablet (as of slate) used for writing on

: to cover with slate or a slatelike substance

: to designate for a specified purpose or action : schedule

: to thrash or pummel severely

: to criticize or censure severely