sleech

Definitions

1. Thick, soft mud that was left behind by flowing water, usually alongside riverbeds or shorelines.
   countable, uncountable
2. A soft, unstable mixture of mud and clay beneath Belfast, which is known for being difficult to build on.
   Northern-Ireland, countable, uncountable

Examples

“The physical nature and engineering properties of the sleech have⟳ made it desirable to investigate⟳ each site before piling.”

CEFR level