in extremis
Concise Oxford English Dictionary © 2008 Oxford University Press:
in extremis /ˌɪn ɛkˈstriːmɪs/
▶adverb
- 1 in an extremely difficult situation.
- 2 at the point of death.
– origin L., from in ‘in’ + extremis, ablative pl. of extremus ‘outermost’.
'in extremis' also found in these Oxford entries:

