1. Root

 dreb

2. Lexical meanings

 EN: run, step, walk

3. Comparative evidence

4. Formally comparable roots

 1.der, 1.dreh₂, 1.drem, 2.der, 2.dreh₂, 2.drem, derkh₂, derkʷh₂, derḱh₂, derbʰ, derd, derdʰ, derh₁gʰ, derh₂gʰ, derh₃gʰ, derh₂, deru̯, dreu̯, derk, derḱ, dret, dregʰ, dreh₁, drep, dreu̯, dreu̯g, dreu̯h₁, dreu̯h₂, dreu̯h₃, dreǵʰ

5. Formally/Semantically comparable roots

 1.dreh₂, 1.drem, 2.der, dret

6. Revised root variants

 1.dreh₂, 2.der

7. Comments

 Watkins 2011: 16f.: extended form of *2.der- ‘run’ attested in Grm. *tred- ‘something on or into which one steps’.

8. References

Watkins 2011 = Watkins, Calvert. 2011. The American heritage dictionary of Indo-European roots. 3rd revised ed. Boston, New York: Houghton Mifflin Harcourt.