The crossword solutions for the term 10/31 OPTION are TREAT and TRICK. The term 10/31 OPTION is a reference to Halloween, which is celebrated on October 31st. The two words TREAT and TRICK are associated with Halloween, as they are activities that children partake in on the holiday. On Halloween, children go door-to-door and say 'TRICK or TREAT' to receive candy or other treats. The word TRICK is also used to describe a mischievous act or prank.