verb (used without object)
Examples from the Web for upthrust
The tented arch is directly beneath the innermost loop, and is of the upthrust type.
Upthrust, up′thrust, n. a thrust upward, an upheaval of a mass of rock.
Mr. Pennypacker leaned with an air of satisfaction against the upthrust bough of a fallen oak.The Young Trailers|Joseph A. Altsheler
The dot at the center is not elongated enough to be considered an upthrust.
I can show you places over there on the East wall of the Sierras where the mountains have been upthrust that way.Unexplored!|Allen Chaffee