Comparative evidence

keu̯bh₂, ḱeu̯bh₂

• Lat. cubō -āre ‘lie down’, ‘recline’, ‘sleep’, ‘lie in death’, ‘rest’ (OLD: 464)

• Lat. -cumbō -ere ‘lie’ (OLD: 494)

References

OLD = Glare, P. G. W. 1968. Oxford Latin Dictionary. Oxford: Clarendon Press.