Noun

• S: (n) oversight, lapse (a mistake resulting from inattention)
• S: (n) lapse (a break or intermission in the occurrence of something) "a lapse of three weeks between letters"
• S: (n) backsliding, lapse, lapsing, relapse, relapsing, reversion, reverting (a failure to maintain a higher state)

Verb

• S: (v) sink, pass, lapse (pass into a specified state or condition) "He sank into nirvana"
• S: (v) lapse (end, at least for a long time) "The correspondence lapsed"
• S: (v) lapse, backslide (drop to a lower level, as in one's morals or standards)
• S: (v) relapse, lapse, recidivate, regress, retrogress, fall back (go back to bad behavior) "Those who recidivate are often minor criminals"
• S: (v) lapse (let slip) "He lapsed his membership"
• S: (v) elapse, lapse, pass, slip by, glide by, slip away, go by, slide by, go along (pass by) "three years elapsed"