Longman Dictionary of Contemporary English
damp course
noun
EXAMPLES FROM CORPUS
▪ That such a monument should now require a damp course is a suitably bizarre commentary on human folly.
Wiktionary
damp course
n. (context construction English) A layer in a wall, foundation etc. which prevents moisture spreading into interior areas.
WordNet
damp course
n. a course of some impermeable material laid in the foundation walls of building near the ground to prevent dampness from rising into the building [syn: damp-proof course]
Usage examples of "damp course".
There was no ventilation, as I'd told Arthur Bellbrook, and no damp course, either.