RhymeZone: overthrust definitions

Definitions of overthrust:

noun: (geology, transitive, intransitive) A form of thrust fault from beneath a hanging wall of rock.
verb: (geology, intransitive) Of a body of rock: to force itself over another.
adjective: (geology) Belonging to earlier strata, pushed by faulting over later and higher strata.

(Definitions from Wiktionary)