कुल-क्षये प्रणश्यन्ति कुल-धर्माः सनातनाः
धर्मे नष्टे कुलम् कृत्स्नम् अधर्मः अभिभवति उत​

कुलक्षये प्रणश्यन्ति कुलधर्माः सनातनाः ।
धर्मे नष्टे कुलं कृत्स्नमधर्मो:ऽभिभवत्युत ॥१:४०॥

kulakshaye pranashyanti kuladharmaah sanaatanaah
dharme nashte kulam kritsnamadharmoh'bhibhavatyuta ||1:40||

kula-kshaye pranashyanti kula-dharmaah sanaatanaah
dharme nashte kulam kritsnam adharmah abhibhavati uta

Purport As the clan declines, the eternally established duties of the clan are destroyed. With destruction of the righteousness in the clan, the depravity overpowers even the entire righteousness.

कुल-क्षये (kula-kshaye) -- in decline of the clan
प्रणश्यन्ति (pranashyanti) -- perish; disappear
कुल-धर्माः (kula-dharmaah) -- established duties of the clan
सनातनाः (sanaatanaah) -- eternal
धर्मे (dharme) -- in righteousness; in performing established duties
नष्टे (nashte) -- in destruction
कुलम् (kulam) -- clan; lineage
कृत्स्नम् (kritsnam) -- entire
अधर्मः (adharmah) -- sinfulness; depravity; irreligiousness
अभिभवति ( abhibhavati) -- overcome; overpower
उत (uta) -- even; also