life-threatening

The compound adjective 'life-threatening' is a modern English formation that transparently combines three native Germanic elements. The word 'life', with ancient roots in Proto-Germanic lībą, establishes the precious entity at risk. It is coupled with 'threat', from Old English 'þrēat', which originally implied a crowd or multitude, later specializing to mean a menacing force. The suffix '-ening' (a variant of '-ing') converts the noun 'threat' into an adjectival participle, creating the sense of 'posing a threat'. Thus, the term's logic is starkly literal: something that 'threatens life' has evolved into a precise medical and legal descriptor for conditions of extreme peril.

Structure: life + threat + ening - life: From Old English 'līf', of Germanic origin; related to Dutch 'lijf' and German 'Leib'. The core noun denoting existence. - threat: From Old English 'þrēat', meaning coercion or menace. The noun denoting a source of danger. - ening: A variant of the suffix '-ing', used to form the present participle of verbs, here functioning to create an adjective from the verbal concept of 'threatening'.