רָבַב râbab (H7231)

properly, to cast together , i.e. increase, especially in number; to multiply by the myriad

1) to be or become many, be or become much, be or become great 1a)(Qal) 1a1) to be or become many 1a2) to be or become great 1a3) to be long (of journey) 2) (Pual) ten thousands

a primitive root; (compare רָבִיב (H7241)); also as denominative from רְבָבָה (H7233);