The crossword solution for the term ending with 'HALLOW' is 'EEN', which is a three-letter word. EEN is an abbreviation for the phrase 'EVENING, ' which is the time of day between afternoon and night. It is also used to refer to the end of the day, especially when referring to the end of a workday or school day. The term 'HALLOW' is often used to refer to a holy or sacred place, so the phrase 'ending with HALLOW' could be referring to the end of the day as a holy or sacred time.