deep-water

The compound 'deep-water' is a transparent combination of two ancient Germanic roots. 'Deep' originates from the Proto-Indo-European root dʰewb-, which conveyed the core concept of depth or a hollow, a meaning preserved remarkably intact through its Germanic descendants into modern English. 'Water' stems from the equally fundamental PIE root wódr̥, essential for life and geography. The compound's logic is directly literal, first describing the physical characteristic of a body of water—its significant vertical extent. This concrete meaning then facilitated a metaphorical extension in commercial and strategic contexts, where 'deep water' signifies ventures or situations that are complex, financially substantial, and potentially hazardous, much like navigating in the profound and unpredictable open ocean.

Structure: deep (having great depth) + water (the liquid H₂O) - deep: From Old English dēop (deep, profound), from Proto-Germanic deupaz, from Proto-Indo-European dʰewb- (deep, hollow). Functions as an adjective describing extent downward or inward. - water: From Old English wæter, from Proto-Germanic watōr, from Proto-Indo-European wódr̥ (water). Functions as a noun, the second element in this compound specifying the domain or medium.