Synonyms and related words :
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