The crossword solutions for the term 'POPULAR INSECT REPELLENT' are 'OFF'. This is a brand of insect repellent that has been around since the 1950s and is one of the most popular insect repellents on the market. It is made with DEET, which is an effective chemical compound that repels mosquitoes, ticks, and other insects. It is available in a variety of forms, including sprays, lotions, and wipes.