רָבַב

rabab (raw-bab') v.
1. (properly) to cast together, i.e. increase, especially in number
2. (as denominative from H7233) to multiply by the myriad
[a primitive root]
KJV: increase, be many(-ifold), be more, multiply, ten thousands. 
Compare: H7241 
See also: H7233

• Part of speech: verb
• Occurrences: 13

• Genesis 6:1

From Strong's Hebrew and Chaldee Dictionary (1890), which is public domain. This bundle carries the words that spell biblical names and the roots they are built from; the full lexicon of 8,674 entries ships as a bulk table.