Wrack is seaweed thrown up on the shore, or ruin. Bladder wrack, wrack on the tideline, wrack and ruin.
Wrack and ruin is the phrase that keeps the second sense alive, and it means complete decay. The seaweed sense is technical and ordinary: bladder wrack is the brown weed with the poppable air bladders.
1nounwrackSeaweed thrown up on the shore, or ruin.
“After the storm, the beach was covered with piles of wrack and driftwood.”
wrack is a thing.
Middle English wrake comes from Old English words for misery and vengeance, and merged with a word for wreckage.
Old English
wracu
Middle English
wrake
English, today
wrack
Built from
From Middle English wrake, wrache, wreche, from a merger of Old English wracu, wræc (“misery, suffering”) and Old English wrǣċ (“vengeance, revenge”). See also wrake.
Etymology from Wiktionary, CC BY-SA