Comparative evidence

terkh₂, terḱh₂, terkʷh₂, derkh₂, derḱh₂, derkʷh₂, dʰerkh₂, dʰerḱh₂, dʰerkʷh₂

• Hitt. tarna- 'let', 'let go', 'allow', leave' (EDHIL: 846ff.)

References

EDHIL = Kloekhorst, A. 2008. Etymological Dictionary of the Hittite Inherited Lexicon. Brill.