sink back

verb

Roget 661: relapse, lapse; fall back, slide back, sink back; return; retrograde etc. 283; recidivate; fall off again etc. 659.   

Moby thesaurus: backslide, fall, fall again into, fall back, fall from grace, have a relapse, lapse, lapse back, recidivate, recur to, regress, relapse, return to, revert, revert to, slide back, slip back, yield again to.

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