lapse

1 lapse /ˈlæps/ noun
plural lapses
1 lapse
/ˈlæps/
noun
plural lapses
Britannica Dictionary definition of LAPSE
[count]
1 
a  : an occurrence in which you fail to think or act in the usual or proper way for a brief time and make a mistake
— often + in
— often + of
b  : an occurrence in which someone behaves badly for usually a short period of time
c  : a change that results in worse behavior
2 
: a period of time between events — often + of
3 
: the ending of something that happens when the payments necessary for it to continue are not made — often + of
2 lapse /ˈlæps/ verb
lapses; lapsed; lapsing
2 lapse
/ˈlæps/
verb
lapses; lapsed; lapsing
Britannica Dictionary definition of LAPSE
[no object]
1 
: to stop for usually a brief time
2 
: to become no longer effective or valid

lapse into

[phrasal verb]
1 
lapse into (something)
: to begin using or doing (something that should be avoided) for a short period of time
2 
: to begin to be in (a worse or less active state or condition)