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RELATED WORDS : behind behind the scenes behind time drop behind fall fall all over fall apart fall armyworm fall asleep fall away fall back fall by the wayside fall cankerworm fall dandelion fall down fall equinox fall flat fall for fall from grace fall guy fall in fall in line fall in love fall in with fall into fall into place fall of man fall off fall open fall out fall over fall over backwards fall short fall short of fall through fall to fall to pieces fall under fall upon fall webworm free fall get behind lag behind leave behind put behind bars stand behind

WORDNET DICTIONARY

Verb fall behind has 2 senses

• fall behind(v = verb.competition) drop off, fall back, lose, recede - retreat; Array
is one way to regress, retrograde, retrogress
Sample sentence:
Somebody ----s

• fall behind(v = verb.motion) dawdle, fall back, lag - hang (back) or fall (behind) in movement, progress, development, etc.; Array
is one way to follow
Sample sentences:
Something ----s
Somebody ----s

THESAURUS

fall behind

back, back up, backslide, cock, come after, come last, dawdle, drag, fall astern, fall back, follow, get behind, go back, go backwards, go behind, hang back, jerk back, lag, lag behind, lapse, linger, linger behind, loiter, lose ground, pull back, recede, recidivate, regress, relapse, retrocede, retroflex, retrograde, retrogress, return, revert, slip back, straggle, trail, trail behind

For further exploring for "fall behind" in Webster Dictionary Online