How did kennings function in Old English and Old Norse poetry?

In Old English and Old Norse poetry, a kenning functioned as a concise, figurative compound phrase used to replace a common noun. Derived from the Old Norse word kenna—meaning to perceive, know, or name—these devices served as essential rhetorical tools for ornamentation and allusion.1

Function and Style

• Metaphorical Substitution: Kennings replaced standard terms with descriptive imagery. For example, the sea might be referred to as a "whale-path" or "swan-road," while a king might be called a "ring-giver".1
• Cultural Allusion: In skaldic poetry, kennings often required deep knowledge of mythology to decipher, such as referring to the sea as "the blue land of Haki".12
• Poetic Structure: In Old English alliterative verse, kennings were part of a formulaic tradition that provided a rich cultural fund for poets, often appearing alongside other devices like variation.3

While heiti (uncompounded poetic nouns) provided simple synonyms, kennings offered complex, indirect circumlocutions that enriched the diction of the verse. These techniques remained remarkably consistent for centuries, reflecting the conservative nature of the literary traditions.23