Lapser

a mistake resulting from inattention

Synonymsoversight

a break or intermission in the occurrence of something

“a lapse of three weeks between letters”

a failure to maintain a higher state

Synonymsbackslidinglapsingrelapserelapsingreversion

pass into a specified state or condition

“He sank into nirvana”

Synonymssinkpass

end, at least for a long time

“The correspondence lapsed”

drop to a lower level, as in one's morals or standards

Synonymsbackslide

go back to bad behavior

“Those who recidivate are often minor criminals”

Synonymsrelapserecidivateregressretrogressfall back

let slip

“He lapsed his membership”

pass by

“three years elapsed”

Synonymselapsepassslip byglide byslip away