The term 'second hand' can be defined by the following crossword solutions: USED (4 letters), OLD (3 letters), ROSE (4 letters), AIDE (4 letters), HELPER (6 letters), and reused (6 letters). USED and reused refer to the idea of something being USED more than once, while OLD and ROSE indicate that the item is not new. AIDE and HELPER are both terms for someone who assists another person. All of these words together suggest that the term 'second hand' refers to something that has been previously owned or USED.