What is the meaning of Graben?

An elongated block of the Earth's crust, bounded by faults, that has dropped relative to the surrounding area.

to dig

to burrow

to dig

[with accusative] to dig

[with accusative] to bury

[with accusative] to engrave

graben

inflection of grabar:

1. third-person plural present subjunctive
2. third-person plural imperative

third-person plural present subjunctive

third-person plural imperative

Source: wiktionary.org