The Proto-Indo-European word k̂euh₁-
Word k̂euh₁-
Meaning to swell, grow great with child
See also Homeric Greek: κυμαίνω ‘rise in waves, swell’
Synonyms *bʰleu-, *pup-, teuh-, *bʰel-, *h₁engʷ-, *hₐeid-