The term 'Firm Hold' can be described by two crossword solutions: GRIP (4 letters) and GRASP (5 letters). GRIP is defined as a strong hold or GRASP, while GRASP is defined as to take hold of something firmly. Both words are used to describe a secure GRIP or hold on an object. They are often used interchangeably, but GRIP is more commonly used to describe a physical hold, while GRASP is more often used to describe a mental understanding.