The term 'back up' can be used to describe a variety of actions. The crossword solutions for this term include 'ABET' (4 letters), 'ASSIST' (6 letters), 'authorize' (9 letters), 'AUTHENTICATE' (12 letters), 'STRENGTHEN' (10 letters), 'SAVE' (4 letters), 'PRONE' (5 letters), 'rewind' (6 letters), 'SECOND' (6 letters), 'SUPINE' (6 letters), 'CONFIRM' (7 letters), 'SUPPORT' (7 letters), 'BUTTRESS' (8 letters), 'ENCOURAGE' (9 letters), 'ESTABLISH' (9 letters), 'INCARNATE' (9 letters), and 'DEMONSTRATE' (11 letters). These words all refer to different ways of providing assistance, SUPPORT, or protection. For example, 'ABET' means to help or ENCOURAGE someone to do something, while 'AUTHENTICATE' means to prove the truth or accuracy of something. Similarly, 'STRENGTHEN' means to make something stronger, and 'SAVE' means to keep something safe. Additionally, 'PRONE' means to be in a position that is facing downwards, while 'SUPINE' means to be lying on one's back. Finally, 'CONFIRM', 'SUPPORT', 'BUTTRESS', 'ENCOURAGE', 'ESTABLISH', 'INCARNATE', and 'DEMONSTRATE' all refer to different ways of providing assistance, SUPPORT, or protection.