Rigveda 8.33.18

सप्ती॑ चिद्घा मद॒च्युता॑ मिथु॒ना व॑हतो॒ रथ॑म् ।ए॒वेद्धूर्वृष्ण॒ उत्त॑रा॥

saptī cidghā madacyutā mithunā vahato ratham |eveddhūrvṛṣṇa uttarā ||

Our plain-language meaning of this verse is waiting for scholar review.