"relapse" in the noun sense
1. backsliding, lapse, lapsing, relapse, relapsing, reversion, reverting
a failure to maintain a higher state
"relapse" in the verb sense
1. get worse, relapse
deteriorate in health
2. relapse, lapse, recidivate, regress, retrogress, fall back
go back to bad behavior
"Those who recidivate are often minor criminals"
Source: WordNet® (An amazing lexical database of English)
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