quedarse atrás

(v.) = fall behind, hang back, trail, trail behind, be behind
Ex: The Porter Public Library houses an all out effort to reach first and second grade pupils who have lost their enthusiasm for school because of falling behind in reading. Ex: This article explores the implications of these threats, maintaining that publishers cannot afford to hang back, but must innovate or atrophy. Ex: International comparisons show that the government's failure to take a lead on information policy leaves the UK trailing badly. Ex: With library services, women have been left trailing behind other user groups, a situation which is slowly being rectified. Ex: They know how to play clay tennis, but their best days probably are behind.