a brief or temporary failure of concentration, memory, or judgement

a lapse of concentration in the second set cost her the match

an interval or passage of time

there was a considerable lapse of time between the two events

(of a right, privilege, or agreement) become invalid because it is not used, claimed, or renewed; expire

he let his membership of CND lapse

pass gradually into (an inferior state or condition)

the country has lapsed into chaos