The term 'double' is used to describe something that is TWOFOLD or duplicated. This can be seen in the crossword solutions INCREASE (8 letters), ESCAPE (6 letters), DUCK (4 letters), RINGER (6 letters), COMPANION (9 letters), DUPE (4 letters), SEE (3 letters), DIP (3 letters), DARE (4 letters), DUAL (4 letters), OVEN (4 letters), TEAM (4 letters), TWIN (4 letters), DAILY (5 letters), STUNT (5 letters), AGENT (5 letters), BINAR (5 letters), CLONE (5 letters), EDGED (5 letters), FAULT (5 letters), TWICE (5 letters), HEADER (6 letters), PARKED (6 letters), CROSSER (7 letters), STANDIN (7 letters), TWOFOLD (7 letters), ENTENDRE (8 letters), DUPLICATE (9 letters), FOLDINTWO (9 letters), LOOKALIKE (9 letters), CARBONCOPY (10 letters), DEADRINGER (10 letters), STIFFDRINK (10 letters), TWOBASEHIT (10 letters), DOPPELGANGER (12 letters), IDENTICALTWIN (13 letters), MULTIPLYBYTWO (13 letters), SPITTINGIMAGE (13 letters), and STARLETSSTANDIN (15 letters). These words all refer to something that is doubled, duplicated, or TWOFOLD in some way.