Duolingo, Inc. (DUOL) has been on a downward spiral lately with significant selling pressure. The stock has declined 15% year to date, a considerable drop compared to the 21.5% rally in the industry it belongs to and the 17.5% rise in the Zacks S&P 500 composite.This drop mirrors the performance of its closest competitors, Coursera (COUR) and Chegg (CHGG) , which have seen declines of 63% and 76%, respectively, over the same period.One-Year Price PerformanceImage Source: Zacks Investment ResearchLooking bey ...