The term 'nail it' is a phrase used to describe the successful completion of a task. The crossword solutions for this term are ACE (3 letters) and SHRED (5 letters). ACE is a term used to describe something that is done perfectly or with great skill, while SHRED is a term used to describe something that is destroyed or torn apart. Therefore, the phrase 'nail it' can be interpreted as doing something perfectly or destroying it completely.