Rashi: Their evil caused the world to change for one year from its six seasons - seeding, harvest, cold, heat, summer and winter.

Ibn Ezra: Just like aridity and heat steal snow, and no trace of it is left in the world, so they will descend to the grave, v'Chote'im ¹ .

Malbim: In summer, people go in boats, and pirates rob them.

Rashi: It means umi'Ymei Sheleg - also those they stole from the world, via their sin.

Malbim: In winter, when water is frozen and boats cannot pass, they dwell in a deep place in deep tunnels in islands, and they sin with Zenus.