Hold on tight is an expression used to emphasize the need for someone to remain in a certain position or situation. The crossword solutions for this term are CLING, CLASP, and GRIP. CLING is an action of holding onto something tightly with one's arms or hands. CLASP is an action of firmly holding something with one's hands or arms. GRIP is an action of firmly holding something with one's hands. All three words describe the action of holding onto something tightly, which is the meaning of the phrase 'hold on tight'.