de ‧ mise /dɪˈmaɪz/ BrE AmE noun [uncountable]
[ Date: 1400-1500 ; Language: Anglo-French ; Origin: Old French demis 'sent away' ]
1 . formal the end of something that used to exist
demise of
the imminent demise (=happening soon) of the local newspaper
2 . formal or law death:
the mystery surrounding Elena’s untimely demise (=when death happens sooner than is normal or expected)
—demise verb [intransitive]