In Genesis 7:14, this signifies lusts and pleasures. (Arcana Coelestia 45[2])

6399. 'A darting serpent on the path' means reasoning from truth regarding good. This is clear from the meaning of 'a darting serpent' as reasoning regarding good, dealt with below; and from the meaning of 'the path' as truth, dealt with in 627, 2333, 3477. The reason why 'a darting serpent on the path' means reasoning from truth regarding good is that 'a serpent' means reasoning, so that 'a darting serpent' means reasoning that pushes itself forward - from truth towards good, since truth residing with those represented by 'Dan' is below, while good is above.