From Longman Dictionary of Contemporary Englishslip away phrasal verb1 to leave a place secretly or without anyone noticing He slipped away into the crowd.2 if something such as an opportunity slips away, it is no longer available This time, Radford did not let her chance slip away. → slip→ See Verb table
Examples from the Corpus
slip away• Then defenceless, all we could do was fight the panic and slowly slip away.• Nat has slipped away and gazes adoringly into the candy counter.• Everything was slipping away, Emmie thought, and it scared her.• But the effort to combat her own sensual response seemed too much to cope with - slipping away far beyond her reach.• Walking in the light of the full moon, thoughts of evil slipping away, leaving her calm.• But I should never have let you slip away so easily. 