The term 'put a hex on' is a phrase used to describe the act of casting a spell or CURSE on someone. The crossword solutions for this term are VOODOO (6 letters), CURSED (6 letters), CURSE (5 letters), and Castaspell (10 letters). VOODOO is an African-based religion that involves the use of magic and spells, while CURSED is an adjective used to describe something that has been CURSED. CURSE is a verb meaning to put a hex on someone, and Castaspell is a noun referring to the act of casting a spell.