Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb fall_behind

2 senses of fall behind

Sense 1
fall back, lose, drop off, fall behind, recede -- (retreat)
       => regress, retrograde, retrogress -- (get worse or fall back to a previous condition)

Sense 2
lag, dawdle, fall back, fall behind -- (hang (back) or fall (behind) in movement, progress, development, etc.)
       => follow -- (to travel behind, go after, come after; "The ducklings followed their mother around the pond"; "Please follow the guide through the museum")