in ex·tre·mis
adverb/ˌɪn ɪkˈstriːmɪs/
/ˌɪn ɪkˈstriːmɪs/
(from Latin, formal)- in a very difficult situation when very strong action is needed
在危急关头；在紧急情况下；在绝境 - at the moment of death
临终；弥留之际
Word OriginLatin, from in ‘in’ + extremis, ablative plural of extremus ‘outermost’.