The term 'pack tightly' can be described by the crossword solutions of JAM (3 letters), TAMP (4 letters), JAMIN (5 letters), STOW (4 letters), CRAM (4 letters), STIVE (5 letters), and STUFF (5 letters). JAM, tamping, jamin, stowing, cramming, stiving, and stuffing are all actions that involve packing items tightly together. JAM is a type of preserve made from fruit and sugar boiled together, while tamping is the act of pressing down firmly on something. Jamin is a variant of JAM, and stowing is the act of putting things away in a neat and orderly fashion. Cramming is the act of packing items into a small space, and stiving is the act of pressing or squeezing something tightly. Finally, stuffing is the act of filling something with material.