undersurface
- n the lower side of anything
- When investigating engineers tore away a wall, they discovered gaping holes in the cement undersurface as well as other alarming examples of shoddy workmanship.
- But Author White's novel carries an undercurrent, nowhere found in Lewis' books, of those acute undersurface tensions detected by the Lynds.
- When it sank again, one of them swam under it, scraping its tender undersurface and triggering a reflex action of its tail that shot it up to the air.