An Etymological Dictionary of the German Language/wimmeln
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wimmeln, vb., ‘to swarm, teem with,’ from late MidHG. (MidG.) wimmen, ‘to be astir, swarm.’ From the same root wem (wam) are derived the equiv. OHG. wimidôn and wimizzen (wamezzen). OHG. wiuman, ‘to swarm with,’ seems to be a reduplicated present of the same root wen (we-wm-).