lapse

(noun) a mistake resulting from inattention. Synonyms: oversight.

(noun) a break or intermission in the occurrence of something. Example: "A lapse of three weeks between letters."

(noun) a failure to maintain a higher state. Synonyms: backsliding, lapsing, relapse, relapsing, reversion, reverting.

(verb) pass into a specified state or condition. Synonyms: sink, pass. Example: "He sank into nirvana."

(verb) end, at least for a long time. Example: "The correspondence lapsed."

(verb) drop to a lower level, as in one's morals or standards. Synonyms: backslide.

(verb) go back to bad behavior. Synonyms: relapse, recidivate, regress, retrogress, fall back. Example: "Those who recidivate are often minor criminals."

(verb) let slip. Example: "He lapsed his membership."

(verb) pass by. Synonyms: elapse, pass, slip by, glide by, slip away, go by, slide by, go along. Example: "Three years elapsed."